DVD system after purchase?

Anyone know for certain if it is possible to add the infiniti rear seat dvd system to an fx45 w/touring & tech package AFTER purchase? Is the car pre-wired for this equipment, etc? I've been told yes by one dealer and no by another, both wanting to sell me the car... I'm aware of the aftermarket systems available, but would much prefer to go with an integrated system by the mfr.