Remote wire for DVD headrests

[Huffman_Josh]

I have a 2015 tahoe LT and just installed dvd headrests
I have all wires ran and everything works but i need to find a power wire under the dash that will act as a remote so that the DVD players will only turn on when the key is in the ignition
Any help would be appreciated

 

[Mark985]

On my Tahoe the cigaratte lighter in the center console is turned on by the key. That's where hard wired the power for the headrest dvd's and works great