With html it is just
<video controls width="90%" src="path-to-video.mp4"></video>
With regex, if you copy path in file manager and agree/refuse to convert it to a relative path when you paste it in note
\[.*?\]\(([^)]+(\.mp4|\.webm|\.3gp))\)
<center><video controls width="90%" src="$1#t=0.1"></video></center><br>
Same with jQuery
<script>$(function(){
$("a[href$='.mp4' i], a[href$='.webm' i], a[href$='.3gp' i]").each(function(){$(this).after('<center><video controls width="90%" src="' + $(this).attr("href") + '#t=0.1"></video></center><br>').remove()})
});</script>
If you add path as ordinary text (do not recommend)
[^\s]*?(\.mp4|\.webm|\.3gp)\b
<center><video controls width="90%" src="$0"></video></center><br>