You can add an event listener with ‘ended’ as first param
Like this :
<video src="https://stackoverflow.com/questions/2741493/video.ogv" id="myVideo">
video not supported
</video>
<script type="text/javascript">
document.getElementById('myVideo').addEventListener('ended',myHandler,false);
function myHandler(e) {
// What you want to do after the event
}
</script>