Tying dash cam into risking screen/backup camera?

[pritch 0]

I'm interested in finding or building a system that could tie into my existing screen and backup camera. The host vehicle I a 2015 Toyota 4Runner with the nav/backup cam screen in the dash.

 

Ideally, I'd like a front-facing camera and a wide-angle camera covering the interior. Automatic recording, as well as camera selection and playback are important.

 

My preference on the forward camera would be behind the grill or in the vicinity of the front bumper, for optimum tag capture and parking assist.

Any ideas?