Teklock JhonnyD, guyes, thanks for interesting discussion 🙂 and clear advice.
I think I got it, so going to order that big harness with OD-LM-01 canbus box and the box needed to plug into the ODB socket. To reach the OBD socket, I guess is somewhere under the dashboard, I will need some OBD splitter-extension. I will check.
That back-reverse cable for camera is behind the radio. There is some extra white connector with 3 wires, one is brown and they used it to power feed the camera. This one I will cramp to the camera harness coming with the Dudu device. Hopefully will work.
I will come back here to tell how it is going.. any more ideas are welcomed..