i need code for human activity deetction using hog approach

namespace HumanActiviyDetection
{
    public partial class Form1 : Form
    {
        Capture _capture;
        Image<bgr,> frame;
        Image<bgr,> previous_frame;
    
        public Form1()
        {
            InitializeComponent();
            _capture = new Capture();
            _capture.ImageGrabbed += processframe;
            _capture.Start();
        }
       
        public Bitmap Find(Image<bgr,> image, ref System.Drawing.Rectangle[] regionsg)
        {
            Rectangle[] regions;
            if (GpuInvoke.HasCuda)
            {
                GpuHOGDescriptor des = new GpuHOGDescriptor();

                des.SetSVMDetector(GpuHOGDescriptor.GetDefaultPeopleDetector());

                using (GpuImage<bgr,> gpuImg = new GpuImage<bgr,>(image))
                using (GpuImage<bgra,> gpuBgra = gpuImg.Convert<bgra,>())
                {

                    regions = des.DetectMultiScale(gpuBgra, 0, new Size(8, 8), new Size(0, 0), 1.04, 8);
                }

            }
            else
            { 
                using (HOGDescriptor des = new HOGDescriptor())
                {
                    des.SetSVMDetector(HOGDescriptor.GetDefaultPeopleDetector());


                    regions = des.DetectMultiScale(image);
                }
            }
            regionsg = regions;

            foreach (Rectangle pedestrain in regions)
            {
                MCvFont font = new MCvFont(Emgu.CV.CvEnum.FONT.CV_FONT_HERSHEY_COMPLEX, 1.0, 1.0);
                image.Draw(new LineSegment2D(new Point(pedestrain.X + ((int)pedestrain.Width / 2), pedestrain.Y + (int)(pedestrain.Height / 4)), new Point(pedestrain.X + ((int)pedestrain.Width / 2), pedestrain.Y + pedestrain.Height - (int)(pedestrain.Height / 6))), new Bgr(Color.Red), 3);

            }
            return image.ToBitmap();

        }
        //public static Rectangle[] Find(Image<bgr,> image, out long processingTime)
        //{
        //    Stopwatch watch;
        //    Rectangle[] regions;

            
        //    if (GpuInvoke.HasCuda)
        //    {  
        //        using (GpuHOGDescriptor des = new GpuHOGDescriptor())
        //        {
        //            des.SetSVMDetector(GpuHOGDescriptor.GetPeopleDetector48x96());

        //            watch = Stopwatch.StartNew();
        //            using (GpuImage<bgr,> gpuImg = new GpuImage<bgr,>(image))
        //            using (GpuImage<bgra,> gpuBgra = gpuImg.Convert<bgra,>())
        //            {
        //                regions = des.DetectMultiScale(gpuBgra);
        //            }
        //        }
        //    }
        //    else
        //    { 
        //        using (HOGDescriptor des = new HOGDescriptor())
        //        {
        //            des.SetSVMDetector(HOGDescriptor.GetDefaultPeopleDetector());

        //            watch = Stopwatch.StartNew();
        //            regions = des.DetectMultiScale(image);
        //        }
        //    }
        //    watch.Stop();

        //    processingTime = watch.ElapsedMilliseconds;

        //    return regions;
       // }




        private void processframe(object sender, EventArgs e)
        {
            if (frame == null)
            {
                frame = _capture.RetrieveBgrFrame();
                displayimage(frame.ToBitmap(), DisplayBox);
                previous_frame = frame.Copy();
            }
            else
            {
                frame = _capture.RetrieveBgrFrame();
                previous_frame = frame.Copy();
                displayimage(previous_frame.ToBitmap(), DisplayBox);
                displayimage(frame.ToBitmap(), CaptureBox);

            }
        }
        private delegate void displaydelegate(Bitmap image, PictureBox contol);
        private void displayimage(Bitmap image, PictureBox control)
        {
            if (CaptureBox.InvokeRequired)
            {
                try
                {
                    displaydelegate di = new displaydelegate(displayimage);
                    this.BeginInvoke(di, new object[] { image, control });
                }
                catch (Exception ex)
                {
                    MessageBox.Show(ex.Message);
                }
            }
            else
            {
                control.Image = image;
            }
        }