There is a solution, but it's not a free solution from our end.
Guys from latviangirls.net ordered this add-on from our services time ago and I suppose, it works for them by now (example
It would also require a bit of knowledge how to set the correct width and height (or where to know them from), because it's actually a BB-code and looks like this:
Also, .mp4 files should be pre-uploaded some way on the server. If this add-on is just for you (server's owner/admin) they are possible to upload by FTP. Else you may need to install a File Bank add-on