Hi Tony,
Noting that the uncompressed video is not mentioned here, AKAIK it's 4.2.2 into an SSD formatted for ProRes, Avid, CineForm etc.
From the online specs,
http://www.nikonusa.com/pdf/manuals/dslr/D800_EN.pdf
Metering TTL: exposure metering using main image sensor
Frame size (pixels) and frame rate:
• 1,920 × 1,080; 30 p (progressive), 25 p, 24 p
• 1,280 × 720; 60 p, 50 p, 30 p, 25 p
Actual frame rates for 60 p, 50 p, 30 p, 25 p, and 24 p are
59.94, 50, 29.97, 25, and 23.976 fps respectively; options support both ★high and normal image quality
File format MOV
Video compression H.264/MPEG-4 Advanced Video Coding
Audio recording format Linear PCM
Audio recording device Built-in monaural or external stereo microphone;
sensitivity adjustable
Other options Index marking, time-lapse photography
HTH's
Rob
