Pic in Pic displays on screen, but two separate tracks record. Front camera is 1080p, rear is 720.
I was thinking of a couple of older no name "GoPro 3?" cameras from China, only $32 CAD ea, and mounting front/back. But those little cameras, I already have one for a back up camera on my van, are very clear.
A little more expensive, but looks like a lot better and easier.