Trying to add video as hover background effect to main menu

Ok. So I made a nice ink drop/smoke effect in after effects with alpha channel. What I’m trying to do with it is to add it as a background effect to main menu so that when you hover a menu item, it would play in background. I know Unreal supports alpha channel for video texture, but I need it to play only when hovered and then to loop a part of it or another video that I made specially for loop. With video texture I can’t do with, but without video texture I can’t use alpha channel. Please help!