Long discussion on that here.
GX - 2nd Gen (2010-2023) - Adding #wide #view and #sideview #camera support - Acrad's mod of adding the driver support computer module opens up the possibility of adding wide-view and sideview camera support. Here is a youtube clip showing the functions of the wide/sideview camera on a 2016 Here...
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I've actually picked up a camera from a '10.. case has a small crack but doesn't affect operation. I am planning to pick back up on mod where I left off a few years ago in thread above. Debate still remains whether Parking Assist ECU needs to be replaced but doubtful. Research indicates that you need two cameras plugged in to auto-detect and they have to be 6V cameras. The stock button on steering wheel for cameras can just be a button trigger to ground anywhere. It is documented in thread.
I also picked up cameras for the mirrors but I would have to retrofit that. Terminals are documented if you wanted to add driver camera that wasn't available in US models until 2020.
I would be running custom wires for the side cameras but pretty easy to test....just need to find time. It has been done on Russian 460s a few years back.