OE Backup camera with new Pioneer HU

Hi:
2015 Prius two with factory back-up camera (no nav).
Want to install my Pioneer AVH-X5600 that I had in my 2009. It has input for a backup camera and also aux video.
I would like to use the OE camera and plug it into the Pioneer BU camera input. Has anyone done this?
I'm thinking of taking the two video wires from the connector and soldering a RCA phono plug.
Any suggestions are welcome.
Thanks,
Don
Naples FL