I received my new AVIC-8100NEX yesterday and completed the install into my 2013 Nissan Xterra in a few hours. I also purchased a $15 item from Amazon which said it would allow the Parking Brake Override feature for in motion video. Here is the link.
The three wires (black, blue and green) from this add-on device were soldered to the appropriate wires on the AVIC wiring harness. Black to black (AVIC), blue to the blue/white (system remote control on AVIC) and green to the green wire (parking brake on AVIC).
Once the install was complete, I attempted to use the HDMI video source while