JSFiddle - React, Tailwind, and code Playground

by KURO KUMO

HTML

<header>HEADER</header>
<div class="slide-wrapper" style="background: url('-- image for devices since video should be display: none !important; --') white no-repeat center center; background-size: cover;">
  <div class="full-video-wrapper">
    <video id="full-video" muted preload autoplay loop>
      <source src="http://vjs.zencdn.net/v/oceans.mp4" type="video/mp4">
      <!-- fallback image -->
      <img src="--- jpg/png here ---" class="video-player--fallback-image" />
    </video>
  </div>
</div>
<main>MAIN CONTENT</main>
<footer>
  <section class="footer-up">LINKS</section>
  <section class="footer-down">COPYRIGHT</section>
</footer>

CSS

html,
body {
  text-align:center;
  margin: 0;
  padding: 0;
  min-height: 100%;
  height: 100%;
  width: 100%
}
header{
  width:100%;
  height:80px;
  background:#fff;
  line-height:80px
}
.slide-wrapper {
  display: block;
  width: 100%;
  height: 400px;
  margin: 0;
  padding: 0;
}

.full-video-wrapper {
  background: white;
  position: absolute;
  top: 80px;
  right: 0;
  bottom: 0;
  left: 0;
  min-width: 100%;
  min-height: 400px;
  width: auto;
  height: 400px;
  z-index: 1;
  overflow: hidden;
}

#full-video {
  display: block;
  position: absolute;
  min-height: 100%;
  min-width: 100%;
  width: auto;
  height: auto;
  top: 0;
  left: 0;
  right: 0;
  bottom: 0;
}
main{
  background:#eee;
  height:400px;
  line-height:400px
}
.footer-down{
  height:120px;
  line-height:120px;
  background:white;
}
.footer-up{
  background:#333;
  line-height:300px;
  height:300px;
  color:white;
}

JavaScript

var $win = $(window),
  $video = $('#full-video'),
  $videoWrapper = $video.parent();

function scaleVideo() {
  var isWider = ($video.width() > $videoWrapper.width()) ? true : false,
    isTaller = ($video.height() > $win.height()) ? true : false,
    widthDifference = $video.width() - $videoWrapper.width(),
    heightDifference = $video.height() - $videoWrapper.height();

  (isWider) ? $video.css('left', -parseInt(widthDifference / 2)): $video.css('left', '0');
  (isTaller) ? $video.css('top', -parseInt(heightDifference / 2)): $video.css('top', '0');
}

scaleVideo();
$win.resize(function() {
  scaleVideo();
});