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HTML

              
                <div id="smooth-wrapper">
  <div id="smooth-content">
<header>
	<h1>Header</h1>
  <a href="#section1">section 1</a>
</header>
<section id="section1" class="section_computer" >
	<div class="no-container relative">
		<div class="colm_2">
			<div class="col">
				<div class="section_computer_wrap">
				<div class="section_computer_content">
					<div class="section_computer_panel panel-1">
						<h3>111 IPSUM DOLOR SIT AMET CONSECTETUR ADIPISICING, ELIT. </h3>
						<p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eos excepturi, ipsam eum aliquam, facere non, dolores natus, deserunt iusto pariatur commodi sed quia quam animi rerum officiis ducimus dignissimos nulla!</p>
					</div>

					<div class="section_computer_panel panel-2">
						<h3>222 IPSUM DOLOR SIT AMET CONSECTETUR ADIPISICING, ELIT. </h3>
						<p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eos excepturi, ipsam eum aliquam, facere non, dolores natus, deserunt iusto pariatur commodi sed quia quam animi rerum officiis ducimus dignissimos nulla!</p>
					</div>

					<div class="section_computer_panel panel-3">
						<h3>333 IPSUM DOLOR SIT AMET CONSECTETUR ADIPISICING, ELIT. </h3>
						<p>Lorem ipsum dolor sit amet consectetur, adipisicing elit. Eos excepturi, ipsam eum aliquam, facere non, dolores natus, deserunt iusto pariatur commodi sed quia quam animi rerum officiis ducimus dignissimos nulla!</p>
					</div>
				</div>
				</div>
			</div>
			<div class="col">
				<div class="clear section_computer_video">
					 <video src="https://assets.codepen.io/39255/output_960.mp4" playsinline="true" webkit-playsinline="true" preload="auto" muted="muted" class="video-background"></video> 
					
</div>
</div>

</div>
</div>
</section> 
<Footer>
	<h1>Footer</h1>
</Footer>
    </div>
</div>
              
            
!

CSS

              
                body,
html {
  margin: 0;
}
header,footer{
  height:100vh;
}

.colm_2:before,
.colm_2:after
{
  content: '';
  display: table;
}

.colm_2{
   width: 100%;
}

@media only screen and (min-width: 768px) {
  .colm_2 .col {
    width: 49.95%;
  }
  .colm_2 .col:nth-child(1n) {
    float: left;
    margin-right: 0px;
    clear: none;
  }
  .colm_2 .col:last-child {
    margin-right: 0;
  }
  .colm_2 .col:nth-child(2n) {
    margin-right: 0;
    float: right;
  }
  .colm_2 .col:nth-child(2n + 1) {
    clear: both;
  }
}

.section_computer {
  width: 100%;
  background-color: #21748f;
  color: #ffc0ce;
  height: 100vh;
  overflow: hidden;
}
.section_computer_wrap {
  position: relative;
  position: relative;
  width: 100%;
  height: 100vh;
}
.section_computer_wrap > * {
  position: absolute;
  top: 50%;
  right: auto;
  bottom: auto;
  left: 50%;
  -webkit-transform: translate(-50%, -50%);
          transform: translate(-50%, -50%);
}
.section_computer_content {
  width: calc(66.6% - 10px);
  height: 100vh;
}
.section_computer_content:nth-child(1n) {
  float: left;
  margin-right: 30px;
  clear: none;
}
.section_computer_content:last-child {
  margin-right: 0;
}
.section_computer_content:nth-child(6n) {
  margin-right: 0;
  float: right;
}
.section_computer_content:nth-child(6n + 1) {
  clear: both;
}
.section_computer_panel {
  height: 100%;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
  -webkit-box-orient: vertical;
  -webkit-box-direction: normal;
      -ms-flex-direction: column;
          flex-direction: column;
  position: absolute;

}
.section_computer .panel-2,
.section_computer .panel-3{
  opacity: 0;
}

.section_computer_video {
  position: relative;
  overflow: hidden;
  width: 100%;
  height: 100vh;
  display: -webkit-box;
  display: -ms-flexbox;
  display: flex;
  -webkit-box-pack: center;
      -ms-flex-pack: center;
          justify-content: center;
  -webkit-box-align: center;
      -ms-flex-align: center;
          align-items: center;
}
.section_computer_video video {
  width: 100%;
}
              
            
!

JS

              
                console.clear();

gsap.registerPlugin(ScrollTrigger, ScrollSmoother,ScrollToPlugin);

  let smoother = ScrollSmoother.create({
  smooth: 2,   // seconds it takes to "catch up" to native scroll position
  effects: true, // look for data-speed and data-lag attributes on elements and animate accordingly
  smoothTouch: 0.1,
});

    var scrollComputer = document.querySelector("header a");
  scrollComputer.onclick = function() {
   console.log("scrollComputer");
   smoother.scrollTo("#computer", true, "top -250px");
 }


const video = document.querySelector(".video-background");
 

let tl = gsap.timeline({
  defaults: { duration: 1 },
  scrollTrigger: {
   trigger: ".section_computer",
   scrub: true,
   //markers: true,
   pin: true,
   start: () => "top top",
   end: () => "+=" + window.innerHeight,
   invalidateOnRefresh: true,
 }
});


tl.add(videoScrub(video, {
  duration: 3.75,
  paused: false
}))

tl.to(".panel-1", {
 keyframes: [
  {yPercent:0},
  {yPercent:-100, opacity:0}
 ]
},1);
  tl.to(".panel-2", {
 keyframes: [
  {xPercent:100, yPercent:100, opacity:0  },
  {xPercent:10, yPercent:80, opacity:1  },
  {xPercent:0, yPercent:0},
  {xPercent:0, yPercent:0 , delay:3 },
  {xPercent:0, yPercent:-100,opacity:0 ,duration:1 }
 ],

},"-=3.2");

  tl.to(".panel-3", {
 keyframes: [
 {xPercent:100, yPercent:100, opacity:0  },
  {xPercent:10, yPercent:80, opacity:1  },
  {xPercent:0, yPercent:0},
  {xPercent:0, yPercent:0 , delay:3 },
  {xPercent:0, yPercent:-100,opacity:0,duration:1  }
 ],
 ease: 'expo.inOut'

},"-=2.2");
console.log("tl duration", tl.duration())
tl.getChildren().forEach(c => console.log("animation", c.startTime(), c.duration()))

function videoScrub(video, vars) {
  video = gsap.utils.toArray(video)[0]; // in case selector text is fed in.
  let once = (el, event, fn) => {
        let onceFn = function () {
          el.removeEventListener(event, onceFn);
          fn.apply(this, arguments);
        };
        el.addEventListener(event, onceFn);
        return onceFn;
      },
      prepFunc = () => { video.play(); video.pause(); },
      prep = () => once(document.documentElement, "touchstart", prepFunc),
      src = video.currentSrc || video.src,
      tween = gsap.fromTo(video, {currentTime: 0}, {paused: true, immediateRender: false, currentTime: video.duration || 1, ease: "none", ...vars}),
      resetTime = () => (tween.vars.currentTime = video.duration || 1) && tween.invalidate();
  // once(video, "loadedmetadata", resetTime);
  prep();
  video.readyState ? resetTime() : once(video, "loadedmetadata", resetTime);
  return tween;
}

              
            
!
999px

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