How to implement custom camera preview in iOS? - swift4

Question

I am trying to implement Custom camera effect like:- Image
I Thought that this is achieve like this way
This type of functionality already implemented in one app which is available in App Store. here is the link enter link description here
I want to copy this app's camera functionality.
I have already implemented something like this.
I am using below code for achieved above functionality.
Into ViewController.swift class.
import UIKit
import AVFoundation
#available(iOS 10.0, *)
class ViewController: UIViewController
{
#IBOutlet weak var vc: UIView!
#IBOutlet weak var img: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
setupCamera()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
session.startRunning()
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
session.stopRunning()
}
#IBOutlet fileprivate var previewView: PreviewView! {
didSet {
previewView.videoPreviewLayer.videoGravity = AVLayerVideoGravityResizeAspectFill
previewView.layer.cornerRadius = previewView.layer.frame.size.width/2
previewView.clipsToBounds = true
}
}
#IBOutlet fileprivate var imageView: UIImageView! {
didSet {
imageView.layer.cornerRadius = imageView.layer.frame.size.width/2
imageView.clipsToBounds = true
}
}
fileprivate let session: AVCaptureSession = {
let session = AVCaptureSession()
session.sessionPreset = AVCaptureSessionPresetPhoto
return session
}()
fileprivate let output = AVCaptureStillImageOutput()
}
#available(iOS 10.0, *)
extension ViewController {
func setupCamera() {
let backCamera = AVCaptureDevice.defaultDevice(withMediaType:
AVMediaTypeVideo)
guard let input = try? AVCaptureDeviceInput(device: backCamera) else {
fatalError("back camera not functional.") }
session.addInput(input)
session.addOutput(output)
previewView.session = session
}
}
// MARK: - #IBActions
#available(iOS 10.0, *)
private extension ViewController {
#IBAction func capturePhoto() {
if let videoConnection = output.connection(withMediaType: AVMediaTypeVideo) {
output.captureStillImageAsynchronously(from: videoConnection, completionHandler: { (CMSampleBuffer, Error) in
if let imageData = AVCaptureStillImageOutput.jpegStillImageNSDataRepresentation(CMSampleBuffer) {
if let cameraImage = UIImage(data: imageData) {
self.imageView.image = cameraImage
UIImageWriteToSavedPhotosAlbum(cameraImage, nil, nil, nil)
}
}
})
}
}
}
Also Create Preview Class and this class into UIView from storyboard file.
From above code I have achived this image.
I need to add any shape of image layer as a frame into UIView. ButI have no idea how to achieved this type of functionality.
So, Basically my task is, how to add any shape of image layer into UIView and after capture image how to save image with image layer, like Final Image clue image