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answered 2013-02-25 07:05:01 -0600
Here is the documentation of VideoCapture. It mentions CV_CAP_PROP_EXPOSURE and CV_CAP_PROP_GAIN as well.
CV_CAP_PROP_EXPOSURE
CV_CAP_PROP_GAIN
The documentation is for version 2.4.4 but I think it has not changed significantly since 2.4.3.