I had a Nikon wireless transmitter for my D7000 and I hoped it would work on my d800. It doesn't. I am pretty sure it was infrared so unless they removed wireless infrared from the D800 I would have assumed it would work.
Anyway the only close thing I found on the Nikon site was something that was in excess of $300.00. My transmitter for the D7000 cost me about $15.00.
I have wound up ordering a third party unit that involves plugging a reciever into the remote terminal and then using a transmitter which has a two step tigger for EL/FL and then for shooting.
Did they remove the infrared triggering capability from the D800?