title: How to change default thumbnail image of embedded video(not a youtube video)
body: <p>I have embedded a video in html. here is the code</p>
  
  <pre><code>&lt;div &gt;
  &lt;video width="400" controls&gt;
      &lt;source src="videos/myvideo.mp4" type="video/mp4"&gt;
  &lt;/video&gt;    
  &lt;/div&gt;
  </code></pre>
  
  <p>i want to change the default thumbnail of the video. Any idea how to do that ?</p>