Thanks, good idea : it might work for the main menu. Interesting solution !
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I'd like to explain my point of view about adding video in a background (for a 1st person game), in case someone could add this feature someday in a new release.
It's not only useful in a Menu :
Imagine that in a game, one of the frames is a PC monitor, like in this picture (arbitrary choice) :
(You can see that what is displayed by this monitor covers a lot of the whole picture)
So with this monitor you want to play a short film of 1 or 2 minutes in the game. The only solutions I see are :
1/ use animation frames
2/ insert a video.
The animation frames solution sounds impossible in this case (unless I'm mistaken), because of the duration and size of the animation to play.
I had done that kind of configuration with a video in my previous game ASA with Adventure Maker. It worked perfectly, the film was playing inside my 3D monitor.
The purpose was to bring movement in a game relying mainly on static views. And this video was used in one of the puzzles, more precisely a quiz. There was a question about the content of the video.
I can imagine many other situations where using video in a background (or instead of a background) would be useful. In Riven, I remember this little gold scarab that was walking on a tree trunk : when you clicked on it, it was going away by flying. It was made with incrusted videos if I remember well.
Not sure if I'm being clear lol I can explain differently.
Anyway, if one of the devs sees this message, please keep this in mind for the future !