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ImageCapture[] has an option Device-> for specifying which camera to use, but CurrentImage[] takes no options and no relevant arguments. Changing $DefaultImagingDevice might or might not work, but it would be a pretty awkward solution for a program that needs to frequently take frames from different cameras quickly.

Is there a way to use CurrentImage[] with more than one camera? If not, is there a better workaround?

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Take a look here – belisarius has settled Aug 15 '13 at 18:44
I'm actually using that function now on a different application on Linux; I was wondering if there was a better workaround than just rewriting that function into taking an argument to pass to cvQueryFrame(). Fortunately, I'm familiar with OpenCV. – Backgammon Aug 15 '13 at 18:48

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