whats the point? I can see for video, but if you already have all nikon glass you probably have a nikon body, so why would you buy a cannon body just for video so you can use your nikon glass on the body when you could just buy a nikon body with video capabilities and use your lenses for photos (w/ autofocus) and for video?
"When people say you have a one track mind, tell them they're only half right. Skiing leaves 2 tracks!" - Seth Morrison
canon video mode in its HDSLRs is leaps and bounds ahead of Nikons. Autofocus sucks on DSLRs when filming, its one of the downfalls that comes with it, and its useless 90% of the time. If you aren't using autofocus anyways you can use whatever glass, and nikon usually has better quality glass and usually has manual aperture too. Canon lenses usually stop up and down when zooming in video mode, so its nice to leave the aperture at a fixed stop.