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well, from the opencv side, it's no problem running multiple cams, it's just like:

VideoCapture cap0(0);
VideoCapture cap1(1);

// later:;;

but reality sucks here, again. the usb bandwidth of a single hub is just enough for 1 cam, if you plug 2 or more into 1 bus, you'll saturate it. you can still reduce the framesize,


and pray, that you got 2 seperate hubs ( try front/back )

good luck!