Dan Sez:

“I generated the video live using the Open Emu QC plugins (openemu.sourceforge.net), which let me play original NES ROMs in emulation, live. I used several ROMs on this song, one written by No Carrier (no-carrier.com) and several more by Chris Covell (nesdev.parodius.com/#NESChris). These ROMs are being played totally live — no pre-recorded video.”

Also check out this starscream video from the same event.