Tryit Editor v2.9

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<!DOCTYPE html> 
<html> 
<body> 

<p>In this example, we use the HTML DOM to assign an "onratechange" event to a video element. The playbackRate property is used to change the playing speed of the video.</p>

<video id="myVideo" width="320" height="240" autoplay controls>
  <source src="movie.mp4" type="video/mp4">
  <source src="movie.ogg" type="video/ogg">
  Your browser does not support the video tag.
</video><br>

<button onclick="setPlaySpeed()" type="button">Set video to be play in slow motion</button>

<script>
// Get the video element with id="myVideo"
var x = document.getElementById("myVideo");

// Set the current playback speed of the video to 0.3 (slow motion)
function setPlaySpeed() { 
    x.playbackRate = 0.3;
} 

// Assign an onratechange event to the video element, and execute a function if the playing speed of the video is changed
x.onratechange = function() {myFunction()};

function myFunction() {
    alert("The playing speed of the video was changed");
}
</script> 

</body> 
</html>