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On this link of the videoCapture set function, you can find all settings that you can adapt as long as your camera actually supports it to be changed by OpenCV.

However this doesn't seems that good news for you:

CV_CAP_PROP_WHITE_BALANCE Currently unsupported

However the exposure option is supported by:

CV_CAP_PROP_EXPOSURE Exposure (only for cameras).

I have checked master (2.4.9) documents and also there whitebalance isn't supported. You will have to file a feature request at the development page of OpenCV.