Use WindowOnTop. Just select any window you want to have on top of your game window and press win+T. I watch movies like that while gathering/fishing/raiding.
edit: Game should be in the a window mode.
edit2: the link i gave leads to the site that wants you to register in order to dl. Wasnt like that before. sorry
So far I have had no luck, If you want to give it a try I would help me out, I just want the Reddit alien wearing a Knights helmet and holding a shield that looks like This