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HTML 

              
                <header>
  <div class="container header-container">
    <div class="d-flex justify-content-between">
      <div>logo</div>
      <div>
        <a href="#">nav item</a>
        <a href="#">nav item</a>
        <a href="#">nav item</a>
        <a href="#">nav item</a>
        <a href="#">nav item</a>
      </div>
    </div>
  </div>
</header>
<main class="container">
  <div>
    <h1>Welcome to Page</h1>
  </div>
  <div class="dummmy-placeholder">
    <h2>this is just a dummy div to create some space to scroll<h2>
  </div>

  <div class="group">

    <div class="part-one" data-lottie-path="https://assets.codepen.io/35984/tapered_hello.json">
      <div class="row">
        <div class="col-6">
          <h2>
            Hello here is some lottie animation
          </h2>
        </div>
        <div class="col-6">
          <div class="lottie-anim">
            <div class="lottie-target"></div>
          </div>
        </div>
      </div>
    </div>
    <div class="part-two">

      <div class="img">
        <img src="https://source.unsplash.com/user/erondu/1600x1300" class="img-fluid">
      </div>
      <div class="part-two-content">
        <div class="row">
          <div class="col-6">
            <h2 class="part-two-title">This could be a title thing</h2>
          </div>
          <div class="col-6">
            <p>Some other Text here.</p>
          </div>
        </div>
      </div>
    </div>
  </div>

  <div class="group">

    <div class="part-one" data-lottie-path="https://assets.codepen.io/35984/tapered_hello.json">
      <div class="row">
        <div class="col-6">
          <h2>
            Hello here is some lottie animation
          </h2>
        </div>
        <div class="col-6">
          <div class="lottie-anim">
            <div class="lottie-target"></div>
          </div>
        </div>
      </div>
    </div>
    <div class="part-two">

      <div class="img">
        <img src="https://source.unsplash.com/user/erondu/1600x1300" class="img-fluid">
      </div>
      <div class="part-two-content">
        <div class="row">
          <div class="col-6">
            <h2 class="part-two-title">This could be a title thing</h2>
          </div>
          <div class="col-6">
            <p>Some other Text here.</p>
          </div>
        </div>
      </div>
    </div>
  </div>

  <div class="group">

    <div class="part-one" data-lottie-path="https://assets.codepen.io/35984/tapered_hello.json">
      <div class="row">
        <div class="col-6">
          <h2>
            Hello here is some lottie animation
          </h2>
        </div>
        <div class="col-6">
          <div class="lottie-anim">
            <div class="lottie-target"></div>
          </div>
        </div>
      </div>
    </div>
    <div class="part-two">

      <div class="img">
        <img src="https://source.unsplash.com/user/erondu/1600x1300" class="img-fluid">
      </div>
      <div class="part-two-content">
        <div class="row">
          <div class="col-6">
            <h2 class="part-two-title">This could be a title thing</h2>
          </div>
          <div class="col-6">
            <p>Some other Text here.</p>
          </div>
        </div>
      </div>
    </div>
  </div>

  <div class="dummmy-placeholder">
    <h2>this is just a dummy div to create some space to scroll<h2>
  </div>

  <div class="dummmy-placeholder">
    <h2>this is just a dummy div to create some space to scroll<h2>
  </div>
  <div class="dummmy-placeholder">
    <h2>this is just a dummy div to create some space to scroll<h2>
  </div>
</main>
!

CSS 

              
                @import url("https://fonts.googleapis.com/css?family=Signika+Negative:300,400&display=swap");

body {
  font-family: "Signika Negative", sans-serif;
  font-weight: 300;
  margin: 0;
  padding: 0;
}

header {
  position: sticky;
  background: white;
  top: 0;
  z-index: 999;
}

.header-container {
  width: 100%;
  max-width: 1920px;
  padding: 10px 60px;
}

// DUMMY

.dummmy-placeholder {
  height: 70vh;
  padding: 60px 40px;
  background: #f3f3f3;
  margin-bottom: 30px;
}

// PART ONE

.part-one {
  padding-block: 4rem;
  position: relative;
  z-index: -1;
}

.lottie-target {
  aspect-ratio: 2/1;
  border: 1px dashed #e1e1e1;
  min-height: 80px;
}

// PART TWO

.part-two {
  display: grid;
  grid-template-areas: "img";
  background: #f3f3f3;
}

.part-two-content,
.img {
  grid-area: img;
}

.part-two-content {
  padding: 30px 40px;
  background: rgba(#fff, 0.5);
  align-self: start;
}

.part-two-title {
  background: rgba(blue, 0.25);
}
!

JS 

              
                function LottieScrollTrigger(vars) {
  let playhead = { frame: 0 },
    target = gsap.utils.toArray(vars.target)[0],
    speeds = { slow: "+=2000", medium: "+=1000", fast: "+=500" },
    st = {
      trigger: target,
      pin: true,
      start: "top top",
      end: speeds[vars.speed] || "+=1000",
      scrub: 1
    },
    ctx = gsap.context && gsap.context(),
    animation = lottie.loadAnimation({
      container: target,
      renderer: vars.renderer || "svg",
      loop: false,
      autoplay: false,
      path: vars.path,
      rendererSettings: vars.rendererSettings || {
        preserveAspectRatio: "xMidYMid slice"
      }
    });
  for (let p in vars) {
    // let users override the ScrollTrigger defaults
    st[p] = vars[p];
  }
  animation.addEventListener("DOMLoaded", function () {
    let createTween = function () {
      animation.frameTween = gsap.to(playhead, {
        frame: animation.totalFrames - 1,
        ease: "none",
        onUpdate: () => animation.goToAndStop(playhead.frame, true),
        scrollTrigger: st
      });
      return () => animation.destroy && animation.destroy();
    };
    ctx && ctx.add ? ctx.add(createTween) : createTween();
    // in case there are any other ScrollTriggers on the page and the loading of this Lottie asset caused layout changes
    ScrollTrigger.sort();
    ScrollTrigger.refresh();
  });
  return animation;
}

// grab all this projects
const groups = gsap.utils.toArray(".group");
var scrub = 1;
var debug = true;

groups.forEach((group, i) => {
  var partOne = group.querySelector(".part-one");
  var partTwo = group.querySelector(".part-two");

  var lottiePath = gsap.getProperty(partOne, "data-lottie-path");
  var lottieTarget = group.querySelector(".lottie-target");

  var starTrigger = group.querySelector(".part-two-title");
  var endTrigger = partTwo;

  var lottieScroller = LottieScrollTrigger({
    target: lottieTarget,
    path: lottiePath,
    trigger: starTrigger,
    start: "top bottom",
    endTrigger: endTrigger,
    end: "bottom center",
    //  end: () => {
    //   return (
    //    "top center+=" + gsap.getProperty(lottieTarget, "height") / 2 + "px"
    //  );
    // },
    pin: false,
    scrub: scrub,
    markers: debug
  });

  // Part One get Sticky
  ScrollTrigger.create({
    trigger: partOne,
    start: () => `center center`,
    endTrigger: partTwo,
    end: "bottom bottom",
    pinSpacing: false,
    pin: true,
    scrub: scrub
  });

  // Part Two Parallax Animation with scroll
  ScrollTrigger.create({
    trigger: partTwo,
    start: `top bottom`,
    end: "top top",
    animation: gsap.from(partTwo, {
      y: "50"
    }),
    pinSpacing: false,
    // pin: true,
    scrub: scrub
  });
});
!
999px

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