Just thought, in some zoos where gorillas have been introduced photographs have been used. Could the video technology used during the course of the Chimpcam project be implemented as a means of the introduction process for the two groups.
I'd question whether Apes can really recognise each other from Photos, or from video/film/t.v etc. I've often wondered when they have Television for Gorillas etc how much, if anything, they recognise from what they see. We can't know.
I would think touch contact through dividing grilles will be the best way for the groups to get properly aquainted with each other..