Oh, it's POSSIBLE alright... whether you'd want to or not is another matter altogether.
For a start, you'd need some software to stream it over your network.
Secondly... and this is actually the big problem... wireless Ethernet is still very much in its infancy compared to "hard" ethernet. Wireless is prone to BIG variations in bandwidth... not to mention RF interference that can come from a whole host of sources. You're probably realistically only going to be able to pump about 15fps down that pipe, perhaps less depending on the quality of the feed.
Besides, wireless ethernet degrades quickly with range.
As for your hard-ethernet nodes (home PC's), you might consider making sure you get a GOOD and RELIABLE 100Mbps connection. If you're running a cheap hub, DISABLE ALL DUPLEXING!! A badly duplexing 100 card does about 3Mbps bandwidth in bursts... it sucks. Even then, you still need the software for the server to stream the video over your network. Certainly possible... but do you have the time, inclination and money it might require?