is there a port independent way to stream video?

[ncpilot]

The firewall where I work blocks almost all ports, except a few that I've been able to find by trial and error.

Some people's cams, because they use strange ports (like 18080 etc...), will not display on my work computer.

And since normally we're streaming our video from home computers, our ISP's will probably block port 80.

So, is there some method of streaming video that will punch through a firewall, no matter what? (i.e., not using port 80)