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Why didn't you do any research first? The error message is even a good hint: There is some device that is running out of some kind of space. And you attach hardware that produces a good deal of data. So probably your usb-controller isn't able to process your images with the current encoding.
a) Enter you error message into google (google.com)
google: libv4l2: error turning on stream: No space left on device
b) select the first or second link:
http://stackoverflow.com/questions/11394712/libv4l2-error-turning-on-stream-no-space-left-on-device
http://answers.opencv.org/question/4909/using-2-webcams-simultaneously/
