VIDEO FEATURE: Add Video Option to Promo Designer

Promo Designer works well if you're using an image, or if you have a written offer of some sort. Taking it one step further, how hard would it be to include the use of video assets in Promo Designer?  I would imagine we could increase our video traffic if we were able to create a pop-up that displays a chosen set of video assets either on load or when exit intent is exhibited. Video assets would be chosen from a Block, a Search or an RSS feed.   how hard would that be to build out?