I could see someone using this on stage in Penn & Teller's Fool Us. The camera hidden in the table, on the table an elaborate box that never comes into contact with the cards, is used as some elaborate red herring (maybe you have to knock on it, or draw something from it), but really serves to hide a small screen.

Now you only have to come up with some impressive card trick that seems impossible to pull off with conventional methods.

Of course you could also come up with a better method to communicate the information than an ipad screen. Maybe a tactile signal.