Webcam access in Silverlight 4

Code snippet to show webcam capture in silverlight 4

CaptureDeviceConfiguration.RequestDeviceAccess();
            CaptureSource _capture = new CaptureSource();
                        _capture.VideoCaptureDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();
            _capture.Start();
            VideoBrush videoBrush = new VideoBrush();
            videoBrush.Stretch = Stretch.Uniform;
            videoBrush.SetSource(_capture);
            rectVideo.Fill = videoBrush;
            rectVideo.UpdateLayout();

Getting the output and resizing it to have a format of a picture that can be used in a profile

_capture.AsyncCaptureImage(img =>
    {
        _capture.Stop();
        TranslateTransform tt = new TranslateTransform();

        tt.Y = -73.5;
        tt.X = -125;
        WriteableBitmap bitmap = new WriteableBitmap(70, 93);

        bitmap.Render(rectVideo, tt);
        bitmap.Invalidate();
        frameImage.Source = bitmap;
        _capture.Start();
    });