I have now surveillance system working with 3 cameras (although I didn't try to look at them from Orbietrs).
I have added what I think is necessary to motion.conf to generate motion videos too - but motion binary would have to be compiled with ffmpeg support. If compiling, I'd suggest to switch to newer stable version of motion - there is better support for net cameras...
Videos will be created in same directories as pictures are, so I guess they can be handled by Orbiters.
Thanks in advance,