Pausar vídeo ao scrollar

HTML

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<video id="myVid" width="100%" muted controls autoplay>
  <source type="video/mp4" src="http://html5demos.com/assets/dizzy.mp4">
</video>

CSS

body {
  background:#e1e1e1;
  height:1000px;
}
video {
  display:block;
  width:300px;
  margin:0 auto;
}

JavaScript

var myvid = $('#myVid')[0];
$(window).scroll(function(){
  var scroll = $(this).scrollTop();
  scroll > 70 ? myvid.pause() : myvid.play()
})