Panasonic GH2 or Nikon 600D?

Which has over video quality footage?

Nikon all the way.

Did you mean the Nikon D600? If so, yes it is leaps and bounds better compared to the GH2.

Nikon D600 Video Review for more info.
http://www.minimalio.com/nikon-d600/

If you're comparing Panasonic GH2 to Nikon D600, then let me tell you what are the advantages of Nikon D600 over GH2.it has around 60% better image quality, Sealed to shoot in the rain, Catch candid moments easily, Around 4x larger sensor, The D600 has excellent image quality 2, 2 f-stops higher ISO than the GH2, Capture more than 50% more detail in your photos, More than 2.5x more shots per battery charge, Combines multiple exposures to capture high dynamic range, Distinguishes 3, 9 more bits of color, 2, 9 f-stops more dynamic range, Around 10% larger screen, More than 4.5x more lenses available, More slots allows storing more images without switching memory cards, 3.7x less delay when turning on, Grab focus in difficult situations, Set focus accurately within the frame, Optical viewfinders save battery life and are more detailed, he D600's boost ISO is 1 f-stop better.phew!
if that was not enough, you may find following reviews helpful:

http://www.amazon.com/...0099XHB4M/

go for Nikon D600.happy snapping