Overlay image over custom camera - ios

Question

I have made a custom camera and want to overlay another image over it. I am using AVKit now to get the custom camera. I was able to overlay the image when I was using the built-in camera. This is the code for what I have for the custom camera. "newImage" is the image that i would like to overlay over the camera.
import UIKit
import AVKit
class liveView: UIViewController, AVCapturePhotoCaptureDelegate {
#IBOutlet weak var previewView: UIView!
#IBOutlet weak var captureImageView: UIImageView!
var captureSession: AVCaptureSession!
var stillImageOutput: AVCapturePhotoOutput!
var videoPreviewLayer: AVCaptureVideoPreviewLayer!
var newImage: UIImage!
override func viewDidLoad() {
super.viewDidLoad()
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(animated)
captureSession = AVCaptureSession()
captureSession.sessionPreset = .medium
guard let backCamera = AVCaptureDevice.default(for: AVMediaType.video)
else {
print("Unable to access back camera!")
return
}
do {
let input = try AVCaptureDeviceInput(device: backCamera)
stillImageOutput = AVCapturePhotoOutput()
if captureSession.canAddInput(input) && captureSession.canAddOutput(stillImageOutput) {
captureSession.addInput(input)
captureSession.addOutput(stillImageOutput)
// videoPreviewLayer?.frame = self.newImage.accessibilityFrame
setupLivePreview()
}
}
catch let error {
print("Error Unable to initialize back camera: \(error.localizedDescription)")
}
}
func setupLivePreview() {
videoPreviewLayer = AVCaptureVideoPreviewLayer(session: captureSession)
videoPreviewLayer.videoGravity = .resizeAspect
videoPreviewLayer.connection?.videoOrientation = .portrait
previewView.layer.addSublayer(videoPreviewLayer)
DispatchQueue.global(qos: .userInitiated).async {
self.captureSession.startRunning()
DispatchQueue.main.async {
self.videoPreviewLayer.frame = self.previewView.bounds
}
}
}
#IBAction func didTakePhoto(_sender : UIBarButtonItem) {
let settings = AVCapturePhotoSettings(format: [AVVideoCodecKey: AVVideoCodecType.jpeg])
stillImageOutput.capturePhoto(with: settings, delegate: self)
}
func photoOutput(_ output: AVCapturePhotoOutput, didFinishProcessingPhoto photo: AVCapturePhoto, error: Error?) {
guard let imageData = photo.fileDataRepresentation()
else { return }
let image = UIImage(data: imageData)
captureImageView.image = image
}
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
self.captureSession.stopRunning()
}
}