b-r-o

    public func flipCamera() {
        sessionQueue.async { [unowned self] in
            self.captureSession.beginConfiguration()
            guard let currentCaptureInput = self.captureSession.inputs.first as? AVCaptureInput else { return }
            self.captureSession.removeInput(currentCaptureInput)
            guard let currentCaptureOutput = self.captureSession.outputs.first as? AVCaptureOutput else { return }
            self.captureSession.removeOutput(currentCaptureOutput)  
            self.position = self.position == .front ? .back : .front
            self.configureSession()
            self.captureSession.commitConfiguration()

b-r-o

self.position = self.position == .front ? .back : .front
self.configureSession()

b-r-o

guard let currentCaptureOutput = self.captureSession.outputs.first as? AVCaptureOutput else { return }
self.captureSession.removeOutput(currentCaptureOutput)

b-r-o

guard let currentCaptureInput = self.captureSession.inputs.first as? AVCaptureInput else { return }
self.captureSession.removeInput(currentCaptureInput)

b-r-o

    public func flipCamera() {
        sessionQueue.async { [unowned self] in
            self.captureSession.beginConfiguration()
            
            // We're going to do all the changes here          
                            
            self.captureSession.commitConfiguration()
        }
    }

b-r-o

    public func flipCamera() {

    }

b-r-o

captureSession.startRunning()

b-r-o

captureSession.stopRunning()

b-r-o

import UIKit
import AVFoundation

protocol FrameExtractorDelegate: class {
    func captured(image: UIImage)
}

class FrameExtractor: NSObject, AVCaptureVideoDataOutputSampleBufferDelegate {
    
    private let position = AVCaptureDevicePosition.front

b-r-o

init() {
    checkPermission()
    sessionQueue.async { [unowned self] in
        self.configureSession()
        self.captureSession.startRunning()
    }
}
    
// MARK: AVSession configuration
private func checkPermission() {