Admirable idea but if you see the big picture you would find that once you got it to work on Outlook Express, it would fail on Thunderbird. This would be a forever task.
Since you asked for video and not AV (audio+video) then why not make an animated GIF from that video? I used SUPER VIDEO CONVERTER to do that and it worked fine.
I need help making a video player that will work in an email. All the codes for video players that the video sharing sites provide for you only seem to work in forums; I can't get them to work in emails. I need a code to make these players work in emails. Or a code to create my own player in emails with files from hosting sites; preferable one that I can set for automatic play.