Head pose estimation with OpenCV java

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I am trying to do head pose estimation with OpenCV java. I am trying to follow http://free-d.org/3d-head-tracking-in... tutorial

now for far i can track the face but how can i use the algorithm once the face is tracked

here are my codes

main:

public class App {

    private JFrame frame;
    private JLabel label;


    private void mainGUI(){
        frame= new JFrame("The Camera");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
        frame.setSize(300,300);
        label=new JLabel();
        frame.add(label);
        frame.setVisible(true);
    }


    /**** Run main Loop  for face detection and all other good stuff ****/
    private void runLoop(){

        String frontFacePath= "/opencv/data/haarcascades/haarcascade_frontalface_alt.xml";


        CascadeClassifier faceCascade = new CascadeClassifier(frontFacePath);


        Mat webCamImg = new Mat();
        Image tmpImg;
        VideoCapture capture = new VideoCapture(0);

        double fps = capture.get(Videoio.CAP_PROP_FPS);
        System.out.println(fps);

        capture.set(Videoio.CAP_PROP_FRAME_WIDTH,300);
        capture.set(Videoio.CAP_PROP_FRAME_HEIGHT,300);
        ConvertImage convertImage = new ConvertImage();


        if (capture.isOpened()){
            while (true){
                capture.read(webCamImg);

                MatOfRect faceRect = new MatOfRect();
                MatOfRect eyeRect = new MatOfRect();
                MatOfRect faceProfile = new MatOfRect();

                faceCascade.detectMultiScale(webCamImg,faceRect);
                eyeCascade.detectMultiScale(webCamImg,eyeRect);
                profileCascade.detectMultiScale(webCamImg,faceProfile);

                for (Rect rect:faceRect.toArray()){
                    Imgproc.putText(webCamImg,"face",
                            new Point(rect.x,rect.y-5),1,1,
                            new Scalar(0,0,225));

                    Imgproc camShow = new Imgproc();

                    camShow.rectangle(webCamImg,
                            new Point(rect.x,rect.y),
                            new Point(rect.x+rect.width,rect.y+rect.height),
                            new Scalar(0,100,200),5);




                    if (capture.grab()){

                        System.out.println("Frame Grabbed ");

                        /*** Calll the Head Pose estimation method    **/
                        HeadPoseEstimationMain hpE = new HeadPoseEstimationMain();
                        //hpE.HPE(webCamImg);
                    }


                    System.out.println("Face");

                }


                if (!webCamImg.empty()){
                    tmpImg= convertImage.convertMatToImg(webCamImg);
                    ImageIcon imageIcon = new ImageIcon(tmpImg,"Captured");
                    label.setIcon(imageIcon);
                    frame.pack();
                }
                else {
                    System.out.println("no frame");
                    break;
                }
            }
        }
        else {
            System.out.println("nothing ");
        }
    }

    /**---------------------------- The main --------------------------**/

    public static void main(String[] args) {
        System.loadLibrary(Core.NATIVE_LIBRARY_NAME);
        App app = new App();
        app.mainGUI();
        app.runLoop();

    }
}

The Heap pose estimation class

public class HeadPoseEstimationMain {

    public void HPE(Mat matOfImg){

        int MaxCount= 10;
        TermCriteria termCriteria = new TermCriteria(TermCriteria.EPS | TermCriteria.COUNT,20,0.3);

        List<MatOfPoint2f> matOfPointList = new ArrayList<MatOfPoint2f>();
        Size subPixWinSize = new Size(10,10);
        Size winSize = new Size (21,21);

        Imgproc.goodFeaturesToTrack(matOfImg, (MatOfPoint) matOfPointList,MaxCount,0.01,10, null,3,true,0.04);
        Imgproc.cornerSubPix(matOfImg, (MatOfPoint2f) matOfPointList,subPixWinSize,new Size(-1,-1),termCriteria);

    }


}

Please help me out