I see an Alpine VPE-V180A

I bet your headphones look like this

You can see the IR window for the headphones.
Here is the manual.
This manual is for the TME-750.
1) You need to find the brain for the monitor and see what is connected to the headphone output socket, with a view to fixing it.
2) You need to find both ends of these cables. They are the rear seat entertainment cables.
3) At the VCR end do you have a power, IR and AV connection - something not shown in the photos. If you have this all in one 13 Alpine RGB connector, you'll want an Alpine DVD player.