NavTV makes a couple of adapters that allow you to add both camera inputs as well as HDMI input to be displayed on your dash.
I used these to add a front camera, as well as to add ROKU TV to my car. Or, I can use my iPHONE HDMI adapter, and mirror my iPhone to the OEM screen
https://navtv.com/products/NTV-KIT80...k-adapter.html
https://navtv.com/products/NTV-KIT780/gm-lvds.html
Me and my custom guy looked at the PAc unit, but the NavTV unit allowed me to do two things
1. Have an HDMI input to install a ROKU system so I have access to my movies online, vevo, youtube, etc.
2. Have the front camera input
There are also units out there that will integrate with the OEM screen for surround view monitoring as well
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'17 White ZL1 A10 Convertible - TM ported TB - RotoFab CAI - 2.3" griptech upper pulley - Kooks 1 7/8" Headers with High Flow Cats - Borla S-type Catback - Audio Overhaul - NavTV M650-GM - 20" BlackDiForza- Michelin Pilot Sport4S - Tuned at BRC Raceworks (606rwhp/675trq)
'14 CTS-V Coupe - ZL1 lid - Ported TB - Ported Snout - AirRad CAI - 8.66" lower - 2.55" upper- Greenbelt - SW Headers - SW Catback - Varimax Intercooler Pump - Track Attack Intercooler-Tuned at BRC Raceworks (551rwhp/516trq)
'17 Maserati Levante- STOCK