Stop

<div id="mediaplayer"></div>
<script>
$("#mediaplayer").kendoMediaPlayer({
    autoPlay: true,
    media: { title: "Kendo UI for jQuery: Welcome and Overview", source: "https://www.youtube.com/watch?v=UbkbVBNYZMc" }
});
// get a reference to the media player widget
var mediaPlayer = $("#mediaplayer").data("kendoMediaPlayer");
// Stop the video
mediaPlayer.stop();
</script>