Im not sure, but maybe you could upload a .gif as Backgroundimage?
I do not recommend using gif at all - also don't recommend using jpg either. Png &/or webp only.
Supposedly in Visionaire Studio 5 we can now directly inject videos into scenes with Lua script. Simon hasn't provided an example of how to go about it yet though. The general idea without using videos though would have just been to create an animation in the same way you normally create animations for VS, which is frame by frame images.