Features: Take pictures and record video, capture function
Core classes:
Capturing sessions: AVCaptureSessin
Capture device: AVCaptureDevice
Capture device input: AVCaptureDeviceInpute
Capture device output: AVCaptureOutput: Abstract class
Including: AVCaptureStillImageOutput
Capture connections: AVCaptureConnection
Capture the preview: AVCaptureVideoPreviewLayer
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