How to change MOG2 paramaters

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I am trying to background subtraction using kinect. I have depth information from kinect depth sensor and I am using mog2. After mog2 background subtraction I have a like this image. .

In this image mog2 applied the threshold but ı do not want the deterioration of the original depth data. I just want to get out of the background and want to protect the original data.

Thanks...