After doing some research I found that it was possible to show a MP4 video as a thumbnail using HTML:
<!DOCTYPE html>
<html lang="en" xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta charset="utf-8" />
<title></title>
</head>
<body>
<video width="400" controls="controls" preload="metadata">
<source src="file:///C:/video.mp4#t=0.5" type="video/mp4">
</video>
</body>
</html>
The problem is that when I try to print preview, the thumbnail is blank. See:
Is it not possible to display a video as a thumbnail and it be visible in print preview? Note that my intention is to not have a video player as such, all I am trying to do is show the video as a thumbnail.