well, my uncle gave me the following advice for photography or video side jobs:
1 - just walk around town and take pictures of some neat stuff
2 - show it to some people and see if they'll buy it!
example: he saw a bunch of catterpillar machines parked on a hill. so, he thought up an intresting angle and took the picture. he showed it to catterpillar, and they bought it! they're gonna use it on their catalog.
example 2: in our area, there is a lot of development going on. there was this one building he thought was interesting, so he went there every week and took some video and stills. he took stills from the same places every week, and video of the workers. once the building was completed, he put together the video and sold it to them. made a nice chunk o' cash.
so, i guess my point is, take video of things you find interesting. if someone wants to buy em, cool.
dabradda