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HTML 

              
                <div id="slider"></div>

<!-- dribbble -->
<a class="dribbble" href="https://dribbble.com/shots/7515563-Balloon-Slider" target="_blank"><img src="https://cdn.dribbble.com/assets/dribbble-ball-mark-2bd45f09c2fb58dbbfb44766d5d1d07c5a12972d602ef8b32204d28fa3dda554.svg" alt=""></a>
!

CSS 

              
                #slider {
    --active: #5628EE;
    --balloon: var(--active);
    --value: #fff;
    --line: #CDD9ED;
    touch-action: none;
    user-select: none;
    width: 320px;
    height: 2px;
    border-radius: 1px;
    background: var(--line);
    position: relative;
    .noUi-connects {
        .noUi-connect {
            background: var(--active);
        }
    }
    .noUi-handle {
        &:before,
        &:after {
            border-radius: 20px;
            transform: scale(var(--s));
            transition: transform .3s ease, border-radius .3s ease;
        }
        &:before {
            --s: .5;
            background: var(--active);
        }
        &:after {
            --s: .2;
            background: #fff;
        }
        &.noUi-active {
            &:before {
                --s: 1;
            }
            &:after {
                --s: 1;
            }
        }
    }
    .balloon {
        --o: 0;
        --s: 0;
        --y: 0;
        --r: 0deg;
        width: 52px;
        height: 68px;
        pointer-events: none;
        position: absolute;
        z-index: 5;
        left: -26px;
        bottom: 0;
        transform-origin: 50% 100%;
        & > div {
            width: 52px;
            height: 68px;
            transform-origin: 50% 100%;
            opacity: var(--o);
            transform: scale(var(--s)) translate(0, var(--y)) rotate(var(--r));
            transition: transform .4s ease, opacity .4s ease;
            &:before,
            &:after {
                content: '';
                display: block;
            }
            &:before {
                width: 52px;
                height: 52px;
                border-radius: 60%;
                border-bottom-left-radius: 480%;
                border-bottom-right-radius: 480%;
                border-top-left-radius: 480%;
                transform: rotate(135deg);
                background: var(--balloon);
            }
            &:after {
                content: attr(data-value);
                font-family: 'Roboto', Arial;
                font-size: 14px;
                font-weight: 500;
                color: var(--value);
                position: absolute;
                left: 0;
                right: 0;
                top: 16px;
                line-height: 24px;
                text-align: center;
            }
            svg {
                display: block;
                width: 8px;
                height: 6px;
                fill: var(--balloon);
                position: absolute;
                left: 22px;
                bottom: 0;
            }
        }
        &.active {
            --o: 1;
            --s: 1;
            --y: -36px;
        }
    }
    // Structure
    * {
        touch-action: none;
        user-select: none;
        -webkit-tap-highlight-color: transparent;
    }
    &.noUi-state-tap .noUi-connect,
    &.noUi-state-tap .noUi-origin {
        transition: transform .3s;
    }
    .noUi-target {
        position: relative;
    }
    .noUi-base,
    .noUi-connects {
        position: relative;
        z-index: 1;
        width: 100%;
        height: 100%;
    }
    .noUi-origin,
    .noUi-connect {
        position: absolute;
        will-change: transform;
        transform-origin: 0 0;
        top: 0;
        left: 0;
        z-index: 1;
    }
    .noUi-connects {
        overflow: hidden;
        z-index: 0;
        border-radius: 1px;
        .noUi-connect {
            width: 100%;
            height: 100%;
        }
    }
    .noUi-handle {
        backface-visibility: hidden;
        position: absolute;
        outline: none;
        cursor: pointer;
        width: 40px;
        height: 40px;
        left: 12px;
        top: -19px;
        &:before,
        &:after {
            content: '';
            position: absolute;
        }
        &:before {
            left: 0;
            top: 0;
            width: 40px;
            height: 40px;
        }
        &:after {
            left: 2px;
            top: 2px;
            width: 36px;
            height: 36px;
        }
    }
    .noUi-origin {
        left: auto;
        right: 0;
        height: 0;
        width: 10%;
    }
}

html {
    box-sizing: border-box;
    -webkit-font-smoothing: antialiased;
}

* {
    box-sizing: inherit;
    &:before,
    &:after {
        box-sizing: inherit;
    }
}

// Center & dribbble
body {
    min-height: 100vh;
    display: flex;
    font-family: 'Roboto', Arial;
    justify-content: center;
    align-items: center;
    background: #F5F9FF;
    .dribbble {
        position: fixed;
        display: block;
        right: 20px;
        bottom: 20px;
        img {
            display: block;
            height: 28px;
        }
    }
}
!

JS 

              
                let slider = document.getElementById('slider'),
    balloon,
    balloonTransform,
    balloonReset;

noUiSlider.create(slider, {
    start: 60,
    connect: 'lower',
    range: {
        min: 0,
        max: 100
    }
});

if(!balloon) {

    let svg = document.createElementNS('http://www.w3.org/2000/svg', 'svg');
    svg.setAttribute('viewBox', '0 0 8 6');
    let path = document.createElementNS('http://www.w3.org/2000/svg', 'path');
    path.setAttribute('d','M3.19770784,0.400189793 L0.183732919,4.48916968 C-0.132777702,4.91857125 -0.0301446804,5.51531196 0.41297019,5.82202737 C0.58019429,5.93777661 0.780561067,6 0.986063367,6 L7.01401322,6 C7.55855868,6 8,5.57222019 8,5.04452705 C8,4.84538453 7.93578945,4.65121861 7.81634366,4.48916968 L4.80236874,0.400189793 C4.48585812,-0.0292117777 3.87005999,-0.128668564 3.42694512,0.178046844 C3.33840792,0.239330552 3.2609487,0.314392601 3.19770784,0.400189793 Z');
    svg.appendChild(path);

    let inner = document.createElement('div');

    inner.appendChild(svg);

    balloon = document.createElement('div');
    balloon.classList.add('balloon');
    balloon.appendChild(inner);

    slider.getElementsByClassName('noUi-base')[0].appendChild(balloon);

    balloonTransform = new Proxy({
        r: 0
    }, {
        set(target, key, value) {
            target[key] = value;
            balloon.style.setProperty('--r', target.r + 'deg');
            return true;
        },
        get(target, key) {
            return target[key];
        }
    });

}

var timestamp = null,
    lastX = null,
    startedMoving = false,
    moved = false;

slider.noUiSlider.on('start', function() {
    let percent = this.get() / this.options.range.max * 100;
    balloon.classList.add('active');
    balloon.childNodes[0].dataset.value = Math.round(this.get());
    TweenMax.to(balloon, 0, {
        x: this.target.offsetWidth * percent / 100,
        scale: .75 + .25 * percent / 100
    });
    balloonReset = setInterval(() => {
        if(!moved && startedMoving) {
            TweenMax.to(slider.getElementsByClassName('noUi-handle')[0], .3, {
                css: {
                    scale: 1
                }
            });
            balloonTransform.r = 0;
            startedMoving = false;
        }
        moved = false;
    }, 20);
});

slider.noUiSlider.on('slide', function() {
    let percent = this.get() / this.options.range.max * 100;
    balloon.childNodes[0].dataset.value = Math.round(this.get());
    if(timestamp === null) {
        timestamp = Date.now();
        lastX = this.get();
        return;
    }
    var now = Date.now(),
        speedX = Math.round((this.get() - lastX) / (now - timestamp) * 160),
        speedX = speedX > 10 ? 10 : speedX < -10 ? -10 : speedX;

    balloonTransform.r = speedX * -2;

    startedMoving = true;
    moved = true;

    TweenMax.to(balloon, 1.4, {
        x: this.target.offsetWidth * percent / 100,
        scale: .75 + .25 * percent / 100,
        ease: Elastic.easeOut.config(1, .6)
    });

    TweenMax.to(slider.getElementsByClassName('noUi-handle')[0], .3, {
        css: {
            scale: .9
        }
    });

    timestamp = now;
    lastX = this.get();
});

slider.noUiSlider.on('end', function() {
    balloon.classList.remove('active');
    clearInterval(balloonReset);
});
!
999px

Console