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BackgroundSubtractorMOG2 is inherited from BackgroundSubtractor which is inherited from cv::Algorithm (read the documentation carefully). That means that you can use Algorithm::set and Algorithm::get methods for accessing parameters. Here is a sample on how you can work with cv::Algorithm.

BTW

1. You can write bg(frame,foreground); instead of your second line.
2. Do not make protected members public, try to avoid the modification of OpenCV header files, it is usually a bad practice.