<!DOCTYPE html>
<html lang="en-US">
<body>
<video style="width:100%;height:330px" onprogress="myFunction()" controls>
<source src="/hawk.mp4" type="video/mp4">
</video>
<script>
function myFunction(){
alert("Video is Downloading");
}
</script>
<p><strong>Note</strong>: While clicking 'ok' in alert pop up, keep your eye's on video's seekbar</p> </body>
</html>