Add the following regex to your Regex for the Compatibility Processor
!\[[^]\n]*\]\(([^)\n]*\.(mp4|avi)[^)\n]*)\)
<center><video src="$1" controls width="50%"/></center>
As a result, markdowns like  will be treated as video tags. So, you will see:
Note: Sorry. This site does not support video playback. But it should in your Epsilon Notes.