Open local file

<video id="v"></video>
<input type="file" id="file" onchange="onChange()" >
<script type="text/javascript">
let URL = window.URL || window.webkitURL;
let video = document.querySelector('#v');
function onChange() {
  let file = document.querySelector('#file');
  video.src = URL.createObjectURL(file.files[0]);;
  video.load();
  video.addEventListener("loadeddata", () => video.play());
}
</script>