private async void buttonPreviewWithVideoStabilizationClick(object sender, RoutedEventArgs e)
        {
            var _capture = new Windows.Media.Capture.MediaCapture();

            try
            {
                await _capture.InitializeAsync();
            }
            catch (UnauthorizedAccessException ex)
            {
                ShowRequestMessageAsync(ex);
                return;
            }



            // キャプチャしたビデオに手ブレ補正効果を追加する
            // http://msdn.microsoft.com/ja-jp/library/windows/apps/xaml/hh868169.aspx
            await _capture.AddEffectAsync(
                Windows.Media.Capture.MediaStreamType.VideoRecord,
                Windows.Media.VideoEffects.VideoStabilization,
                null);



            capturePreview.Source = _capture;
            await _capture.StartPreviewAsync();
        }