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public MainPage()
{
_CaptureSource = new CaptureSource();
_CaptureSource.VideoCaptureDevice = CaptureDeviceConfiguration.GetDefaultVideoCaptureDevice();
VideoBrush videoBrush = new VideoBrush();
videoBrush.SetSource(_CaptureSource);
myRecangle.Fill = videoBrush;
if (CaptureDeviceConfiguration.AllowedDeviceAccess || CaptureDeviceConfiguration.RequestDeviceAccess())
{
_CaptureSource.Start();
}
}