Background subtraction with shadow removal - c++

Question

I'm working with KTH dataset which contains videos for basic human action. I've tried to subtract the background using opencv-2.4.9 BackgroundSubtractorMOG2, but still getting the shadows in the result.
Here is the code (written in C++) that I'm using:
#include <opencv2/core/core.hpp>
#include <opencv2/highgui/highgui.hpp>
#include <opencv2/video/background_segm.hpp>
//C
#include <stdio.h>
//C++
#include <iostream>
#include <sstream>
using namespace cv;
using namespace std;
//global variables
Mat frame; //current frame
Mat fgMaskMOG2; //fg mask fg mask generated by MOG2 method
Ptr<BackgroundSubtractor> pMOG2; //MOG2 Background subtractor
int keyboard;
//function declarations
void processVideo(char* videoFilename);
int main(int argc, char* argv[])
{
pMOG2 = new BackgroundSubtractorMOG2(); //MOG2 approach
pMOG2->setInt("nmixtures",3);
pMOG2->setDouble("fTau",0.5);
processVideo("person14_boxing_d1_uncomp.avi");// read the avi file
//destroy GUI windows
destroyAllWindows();
return EXIT_SUCCESS;
}
void processVideo(char* videoFilename) {
//create the capture object
VideoCapture capture(videoFilename);
if(!capture.isOpened()){
//error in opening the video input
cerr << "Unable to open video file: " << videoFilename << endl;
exit(EXIT_FAILURE);
}
//read input data. ESC or 'q' for quitting
while( (char)keyboard != 'q' && (char)keyboard != 27 ){
//read the current frame
if(!capture.read(frame)) {
cerr << "Unable to read next frame." << endl;
cerr << "Exiting..." << endl;
//exit(EXIT_FAILURE);
return;
}
pMOG2->operator()(frame, fgMaskMOG2, 0.1
imshow("FG Mask MOG 2", fgMaskMOG2);
//get the input from the keyboard
keyboard = waitKey( 30 );
}
//delete capture object
capture.release();
}
So please help me to change the code so that I can get a better result.