If I understand correctly, you can use images as backdrops in Pro Studio. Select your main camera, and in the settings palette on the upper right, you'll see an icon that looks like a screen on a tripod with a star on it. Click that and you'll be able to select your background image. I haven't been able to import an image sequence for animated backgrounds like the dialog seems to suggest I can, but I've often imported single images for still backgrounds.

Of course, I'm having some other severe problems with Vue right now (posting them elsewhere shortly), so my advice should be taken with a grain of salt... ;)