The Super Nintendo controller is one of the best out there from a nostalgia perspective, which is why Caccese used it here. He takes an official controller, rips it apart, then wires in a Raspberry Pi Zero. The whole thing attaches to the TV with a HDMI cable and is powered by an internal battery.
You'll need some soldering skills here, but it's not horribly complex. Head over to YouTube for the guide, wiring diagram and everything else you'll need.