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opencv, aruco marker tracking and high resolution cameras

Hello all, I need to track several aruco markers using Open CV. the problem is the tracking space is large (about 4'x6' square table). A HD webcam simply does not produce enough pixel density for OpenCV. Does openCV work with high resolution video feeds? I was thinking of hooking up a DSLR with a realtime capture card, and feed that to OpenCV. Wondering if there are any resolution restrictions. (barring that, there obviously will be be a performance hit, but that may be fine as my application does not require high framerates)