I'm guessing their "cart" is really a Raspberry Pi like device that is using the NES only for video out and controller in.<p>There is no way in hell a 1.79Mhz 6502 can play streaming video.<p>It's a fun party trick though.
Direct link to the Youtube, gizmodo article doesn't really add any value:<p><a href="https://www.youtube.com/watch?v=_yn-rNdYZAY" rel="nofollow">https://www.youtube.com/watch?v=_yn-rNdYZAY</a>