Route the video wire along the bottom of the dash and then to the side wall.
Run the wire under the door sill along the driver side.
Then route along back door sill. Picture with door sill removed. Just pull up and forward a little and the the door sill pops out easily.
I'm not sure about this part, but I know the installer removed the beige cover for the air bag that's on the top half the the trunk area. There is at least one screw holding this cover.
I believe this is how you can route the wire the back seat up to the hatch conduit.
This is where you want to run the wire up to the hatch.