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pack anything required into a struct.

struct MouseParams
{
    Mat img;
    Point pt;
    int lucky;
};


static void onMouse( int event, int x, int y, int, void* param)
{
    // Mount back the parameters
    MouseParams* mp = (MouseParams*)param;
    Mat & img = mp->img;
    mp->pt = Point(x,y);
    // ...    

}


int main() 
{
    MouseParams mp;
    setMouseCallback("draw mask", onMouse, (void*)&mp);

    imshow("hi",mp.img);
}