Camera is #1 in
diagram.
On ebay, a new OEM camera only is $339.61; used is $210.
I am still unsure of additional needed wiring and whether ECU would have to be switched to accept.
I have found non-OEM cameras with rotating capability for $15-20, but looks like I would need $200-400 multimedia interface and use up one of the hotkeys to enable.
For front dash cam, I would think Bimmertech Smartview type solution and cam with wifi would work better.