JSFiddle - React, Tailwind, and code Playground

HTML

<script>
function t() {
 
  var preview = document.querySelector('embed');
  var video    = document.querySelector('input[type=file]').files[0];
  var reader  = new FileReader();

  reader.onloadend = function () {
    preview.src = reader.result;
  }

  if (video) {
    reader.readAsDataURL(video);
  } else {
    preview.src = "";
  }
  
};
</script>
<input type="file" name="fileupload" value="fileupload" id="fileupload"> <label for="fileupload"> Select a file to play</label>
<embed id="video" width="330" height="220" scr="">

<button id="submit" value="submit" onclick="t();">play</button>