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AVCaptureDevicePosition enumeration specifies the position of a capture device.

const AVCaptureDevicePosition = {
    Front: 0,
    Back: 1,
    Unspecified: 2,
Constant Description
Unspecified the capture device is on the front of the unit
Back the capture device is on the back of the unit
Front the capture device’s position relative to the system hardware is unspecified


For more information, please see the official Apple documentation.