How to convert BackgroundSubtractorMOG2 to bitmap

Question

I have checked this thread :

It seems like in java,just use:

Utils.matToBitmap(mRgba, bitmap);

Would someone please tell me how to do this in python?

Update I actually want to combine wxwidget with open cv like this

class BaseImageView(wx.BoxSizer):
    def __init__(self, project, panel, fps=5):
        .......    
        #blow line will give error
        self.bmp = wx.BitmapFromBuffer(width, height, self.removeBG(frame))
        self.image = statbmp.GenStaticBitmap(panel, wx.ID_ANY, self.bmp)
        self.Add(self.image)
        .......

    def removeBG(self, origFrame): 
        return  cv2.createBackgroundSubtractorMOG2().apply(origFrame)