private async Task StartPreviewAsync()

in src/CognitiveKioskUWP/MainPage.xaml.cs [199:279]
53 lines of code
4 McCabe index (conditional complexity)

        private async Task StartPreviewAsync()
        {
            try
            {
                var devices = await DeviceInformation.FindAllAsync(DeviceClass.VideoCapture);
                var deviceList = devices.ToList();
                var device = devices.FirstOrDefault(x => x.Name.Contains(settings.CameraKey));
                string deviceId = device == null ? "" : device.Id;


                mediaCapture = new MediaCapture();
                await mediaCapture.InitializeAsync(new MediaCaptureInitializationSettings() { SharingMode = MediaCaptureSharingMode.ExclusiveControl, VideoDeviceId = deviceId });
                var resolutions = mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview).ToList();

                var availableResolutions = mediaCapture.VideoDeviceController.GetAvailableMediaStreamProperties(MediaStreamType.VideoPreview).Cast<VideoEncodingProperties>().OrderByDescending(v => v.Width * v.Height * (v.FrameRate.Numerator / v.FrameRate.Denominator));
                //1080p or lower
                var reslution = availableResolutions.FirstOrDefault(v => v.Height <= 1080);

                // set used resolution
                await mediaCapture.VideoDeviceController.SetMediaStreamPropertiesAsync(MediaStreamType.VideoPreview, reslution);

                mediaCapture2 = new MediaCapture();
                await mediaCapture2.InitializeAsync(new MediaCaptureInitializationSettings() { SharingMode = MediaCaptureSharingMode.SharedReadOnly, VideoDeviceId = deviceId });

                mediaCapture3 = new MediaCapture();
                await mediaCapture3.InitializeAsync(new MediaCaptureInitializationSettings() { SharingMode = MediaCaptureSharingMode.SharedReadOnly, VideoDeviceId = deviceId });

                mediaCapture4 = new MediaCapture();
                await mediaCapture4.InitializeAsync(new MediaCaptureInitializationSettings() { SharingMode = MediaCaptureSharingMode.SharedReadOnly, VideoDeviceId = deviceId });

                displayRequest.RequestActive();
                DisplayInformation.AutoRotationPreferences = DisplayOrientations.Landscape;

                // Create the definition, which will contain some initialization settings
                var definition = new FaceDetectionEffectDefinition();

                // To ensure preview smoothness, do not delay incoming samples
                definition.SynchronousDetectionEnabled = false;

                // In this scenario, choose detection speed over accuracy
                definition.DetectionMode = FaceDetectionMode.HighQuality;
                imageAnalysisRunning = false;

                // Add the effect to the preview stream
                _faceDetectionEffect = (FaceDetectionEffect)await mediaCapture.AddVideoEffectAsync(definition, MediaStreamType.VideoPreview);

                // Choose the shortest interval between detection events
                _faceDetectionEffect.DesiredDetectionInterval = TimeSpan.FromMilliseconds(300);

                // Start detecting faces
                _faceDetectionEffect.Enabled = true;

                // Register for face detection events
                _faceDetectionEffect.FaceDetected += _faceDetectionEffect_FaceDetectedAsync;
                timerFailsafe.Start();
            }
            catch (Exception)
            {
                // This will be thrown if the user denied access to the camera in privacy settings
                Console.Write("The app was denided access to the camera");
                faceLastDate = DateTime.Now.Subtract(new TimeSpan(1, 1, 1));
                return;
            }

            try
            {
                captionsControl.MainCapture.Source = mediaCapture;
                speechControl.MainCapture.Source = mediaCapture2;
                tagsControl.MainCapture.Source = mediaCapture3;
                facesControl.MainCapture.Source = mediaCapture4;
                await mediaCapture.StartPreviewAsync();
                await mediaCapture2.StartPreviewAsync();
                await mediaCapture3.StartPreviewAsync();
                await mediaCapture4.StartPreviewAsync();
            }
            catch (Exception)
            {
                //mediaCapture.CaptureDeviceExclusiveControlStatusChanged += MediaCapture_CaptureDeviceExclusiveControlStatusChanged; ;
            }

        }