Nerves USB camera

Is there an existing solution that I can use to read from an USB camera ?(and expose it to internet)
All I found is the picam library, but from my understanding you can use it only with raspberry camera module.
If at the moment there is no solution for that, how hard is it to implement it? any suggestions for that?
Thank you

P.S.: Or any other suggestion than nerves

I have the same question, can anyone answer this?