Years ago I saw a great programme about ants and their society, very detailed. I haven't seen it since and haven't come across it in any of the more familiar collections (David Attenborough etc). I would love to get a copy of this, or something similar.
I know its not a video but if you wanted a great book on ants then get hold of 'The Earth Dwellers' by Erich Hoyt published in 1998 by Mainstream ISBN 1-84018-087-0
I'm pretty sure the film you're posing the question for is called 'The Helmstrom Chronicle'...(at least I think that's how it's spelt)..Bloody good film by the way...Good luck!