# System video effects and microphone modes Configure the state of system video effects like Center Stage, and inspect enhancements the system applies to microphone audio. ## Topics ### Performing reaction effects [`reactionEffectsEnabled`](/documentation/AVFoundation/AVCaptureDevice/reactionEffectsEnabled) A Boolean value that indicates whether the app supports performing reaction effects. [`canPerformReactionEffects`](/documentation/AVFoundation/AVCaptureDevice/canPerformReactionEffects) A Boolean value that indicates whether you can perform reaction effects on a capture device. [`availableReactionTypes`](/documentation/AVFoundation/AVCaptureDevice/availableReactionTypes) A set of reactions types that a device supports performing. [`reactionEffectGesturesEnabled`](/documentation/AVFoundation/AVCaptureDevice/reactionEffectGesturesEnabled) A Boolean value that indicates whether gesture detection triggers reaction effects on the video stream. [`performEffect(for:)`](/documentation/AVFoundation/AVCaptureDevice/performEffect(for:)) Performs the specified reaction type on the video stream. [`reactionEffectsInProgress`](/documentation/AVFoundation/AVCaptureDevice/reactionEffectsInProgress) An array of reaction effects that the device is currently performing, sorted by timestamp. [`AVCaptureReactionEffectState`](/documentation/AVFoundation/AVCaptureReactionEffectState) An object that reports the state of a reaction effect performed on a capture device. ### Configuring Center Stage [`isCenterStageActive`](/documentation/AVFoundation/AVCaptureDevice/isCenterStageActive) A Boolean value that indicates whether Center Stage is active on a device. [`isCenterStageEnabled`](/documentation/AVFoundation/AVCaptureDevice/isCenterStageEnabled) A Boolean value that indicates whether a user or an app enabled Center Stage on a device. [`centerStageRectOfInterest`](/documentation/AVFoundation/AVCaptureDevice/centerStageRectOfInterest) The effective region within the output pixel buffer to perform Center Stage framing. [`centerStageRectOfInterestSupported`](/documentation/AVFoundation/AVCaptureDevice/centerStageRectOfInterestSupported) [`centerStageControlMode`](/documentation/AVFoundation/AVCaptureDevice/centerStageControlMode-swift.type.property) A value that indicates the current mode of Center Stage control. [`AVCaptureDevice.CenterStageControlMode`](/documentation/AVFoundation/AVCaptureDevice/CenterStageControlMode-swift.enum) Constants that indicate the current Center Stage control mode. ### Configuring Studio Light [`isStudioLightActive`](/documentation/AVFoundation/AVCaptureDevice/isStudioLightActive) A Boolean value that indicates whether Studio Light is active on a device. [`isStudioLightEnabled`](/documentation/AVFoundation/AVCaptureDevice/isStudioLightEnabled) A Boolean value that indicates whether a user enabled Studio Light on a device. ### Inspecting the Portrait Effect settings [`isPortraitEffectActive`](/documentation/AVFoundation/AVCaptureDevice/isPortraitEffectActive) A Boolean value that indicates whether the Portrait video effect is active on a device. [`isPortraitEffectEnabled`](/documentation/AVFoundation/AVCaptureDevice/isPortraitEffectEnabled) A Boolean value that indicates whether the user enabled the Portrait video effect in Control Center. ### Inspecting the microphone mode [`activeMicrophoneMode`](/documentation/AVFoundation/AVCaptureDevice/activeMicrophoneMode) The device’s active microphone mode. [`preferredMicrophoneMode`](/documentation/AVFoundation/AVCaptureDevice/preferredMicrophoneMode) The microphone mode that the user selects in Control Center. [`AVCaptureDevice.MicrophoneMode`](/documentation/AVFoundation/AVCaptureDevice/MicrophoneMode) Constants that define the available microphone modes. ### Presenting the configuration user interface [`showSystemUserInterface(_:)`](/documentation/AVFoundation/AVCaptureDevice/showSystemUserInterface(_:)) Displays the system’s user interface to configure video effects or microphone modes. [`AVCaptureDevice.SystemUserInterface`](/documentation/AVFoundation/AVCaptureDevice/SystemUserInterface) Constants that describe the capture device configuration user interfaces. ### Configuring background replacement [`isBackgroundReplacementActive`](/documentation/AVFoundation/AVCaptureDevice/isBackgroundReplacementActive) A Boolean value that indicates whether Background Replacement is currently active on a capture device. [`isBackgroundReplacementEnabled`](/documentation/AVFoundation/AVCaptureDevice/isBackgroundReplacementEnabled) A class property that indicates whether a person enables the Background Replacement feature for this app. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)