Hi makenzi.exc,
Following are the functions of video element to handle play, pause and stop.
play - Play and resume an video.
pause - Pause the video.
For stopping an video pause function will be used and currentTime is set to 0.
Refer below example.
HTML
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title></title>
<style type="text/css">
body { font-family: Arial; font-size: 10pt; }
</style>
</head>
<body>
<video width="320" height="240" controls>
<source src="https://www.aspsnippets.com/videos/welcome.mp4" type="video/mp4">
</video>
<br /><br />
<input type="button" value="Play" onclick="Play()" />
<input type="button" value="Pause" onclick="Pause()" />
<input type="button" value="Stop" onclick="Stop()" />
<script type="text/javascript">
var video_player = document.querySelector("video");
function Play() {
video_player.play();
};
function Pause() {
video_player.pause();
};
function Stop() {
video_player.pause();
video_player.currentTime = 0;
};
</script>
</body>
</html>
Demo
Screenshot

Downloads
Download Sample