The source is not out yet (hence why it's in WIP). There is no mod for users, it will be a drop-in Java package for mod developers to use, rather than a standalone mod.
More screenshots will be available when it is further along; currently I'm focused on improving it for use within MineColonies itself.
There will not be a video, at least not by me - I don't do videos. Also, while it is a GUI library, it is a library rather than a mod. Not something that lends itself to video presentation.