I don't remember by heart but I think the USB is limited to some 4m
or so. This can be overcome one or two times by using hub and
that's pretty much it (or somewhere close). You can try to cut the
USB cable in the middle and splice it with your own 4-wire shielded
cable. I wouldn't expect it to work on ca 1000% above spec but
it you do try it let us know if it workes.
As an alternative, you can google for ethernet cameras.
Maybe someone else has better idea...
Under specifications, the maximum cable length is 5m. Using hubs, you are allowed to extend up to a maximum of 30m. The problem lies with the signal. When electrical conductors get too large, their resistances/inductance/capacitances come into play to lead to signal distortion.
You can try pushing the limits, but there's no guarantee it would work. Why not hang a wireless camera? It could work, albeit at lower resolutions.
i would go with just the USB hubs make the cable longer that way the signal would not suffer as badly. that would probly be the easest way to do it as well.