w3schools html5 video example

example.html

<h2 class="example">Example 1</h2>
<p class="example">Create simple play/pause + resize controls for a video:</p>
<div class="example_code notranslate">
  <br>
  <div style="text-align:center"> 
  <button onclick="playPause()">Play/Pause</button> 
  <button onclick="makeBig()">Big</button>
  <button onclick="makeSmall()">Small</button>
  <button onclick="makeNormal()">Normal</button>
  <br><br> 
  <video id="video1" width="480">
    <source src="mov_bbb.mp4" type="video/mp4"><source src="mov_bbb.ogg" type="video/ogg">Your browser does not support HTML5 video.
  </video>
</div> 

<script> 
var myVideo=document.getElementById("video1"); 

function playPause()
{ 
if (myVideo.paused) 
  myVideo.play(); 
else 
  myVideo.pause(); 
} 

function makeBig()
{ 
myVideo.width=600; 
} 

function makeSmall()
{ 
myVideo.width=320; 
} 

function makeNormal()
{ 
myVideo.width=480; 
} 
</script>