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An app I want to make only makes sense with a TrueDepth camera for ARKit and augmented reality face tracking capability. Can I require a user to have a True Depth camera(iPhone X only right now) to download my app from the App Store?
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Aside from Face ID, the TrueDepth camera has other applications that allow the phone to dim its display when you look away to save battery or reduce the volume of notifications when you are looking at your device.
The Aquifer app (iOS) uses the iPhone's TrueDepth camera system (if available on device) to track the movement of a user's facial expressions to transfer them onto 3D characters for character facial animation. For this to workflow, the app requires access to the user's device camera.
The TrueDepth camera is intelligently activated; for example, by tapping to wake your screen, from an incoming notification that wakes the screen, or by raising to wake your iPhone. Each time you unlock your device, the TrueDepth camera recognizes you by capturing accurate depth data and an infrared image.
Apple's mechanism for segregating App Store listings by device capabilities does include a front-depth-camera key. However, that key is not enabled for use by third-party apps, and Apple doesn't include it in the list of device capabilities that third-party apps can use to limit App Store availability of an app. If you include that key in your app's Info.plist, it has no effect on the App Store — your app will still be offered to devices without a TrueDepth camera.
Unless/until that changes, you can't really make an app that absolutely requires the TrueDepth camera. App Store guidelines require that baseline app functionality is the same across supported devices.
Instead, treat features based on the depth camera as secondary or supplementary to your app's core feature set — for example, if you have an app that adds visual effects to selfie-cam imagery, offer ARKit-based effects on devices that support face tracking and simpler effects on devices that don't. (Check ARFaceTrackingConfiguration.isSupported to see if you're running on the right hardware.)
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Just add front-depth-camera to the Required Capabilities section in your info.plist.
https://developer.apple.com/library/content/documentation/DeviceInformation/Reference/iOSDeviceCompatibility/Cameras/Cameras.html#//apple_ref/doc/uid/TP40013599-CH107-SW38
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