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2017-04-24 04:58:15 -0500 received badge  Necromancer (source)
2017-04-22 11:26:33 -0500 answered a question Opencv 3.1 capture from multiple cameras.

Old thread, but still rather relevant.
USB2.0 hubs don't have the bandwidth to handle more than one camera. It needs one hub per camera. In a desktop machine you can get it by using one PCI USB board for each camera.
The reason why USB3 does not help, is that the USB3.0 hub serves the USB2.0 camera by simply switching into 2.0 mode. So the minute you connect a 2.0 camera, you'll have a 2.0 hub on the other end, thus there is no way to utilize the extra bandwidth of the 3.0. with 2.0 cameras. The solution here is also to use more than one hubs.