Factory Backup Camera with Aftermarket Head Unit?

Flaveless

Hey guys.

I was wondering if anyone has recently managed to wire up their factory backup camera with the HomeLink mirror to their after market head unit, where both are able to display the camera feed.

I've checked out a couple threads on this topic with no major success, except for one post (below), but it's still kinda iffy. I've seen one other post with someone else that's done it, but there wasn't a guide.

Stock backup cam with aftermarket radio?

Does anyone know the exact wires? I'm assuming from that post, he meant that you need to tap into the grey shield wires, but I'm curious about the white wire.

Any help is appreciated. Thanks!