Here are short instructions for retrofitting the reversing camera. More details will follow later.

Required camera: Link

After installation, activate the camera using FORScan: Rear Vehicle Camera – enable

Step 1: Unscrew the center console and dashboard

Step 2: Locate the APIM module

Step 3: remove the connector

Step 4: attach camera pins to connector

Pin 14 Video +
Pin 15 Video –
Pin 33 Grund

Step 5: move the camera to the rear

Step 6: functional tests

Many thanks to Mathias alias hucky0611 for the information and the pictures provided