インカメラの指定方法

前提・実現したいこと

インカメラを使ってQRコードの読み取りを行いたいです。

ここに質問の内容を詳しく書いてください。
アウトカメラを使ってQRコードを読み取る様にはできましたが、インカメラを指定できません。
どの様にして、インカメラを指定したら良いでしょうか。

該当のソースコード

import AVFoundation
import UIKit

class MyQRCodeReader {

let captureSession = AVCaptureSession()
let videoDevice = AVCaptureDevice.default(for: AVMediaType.video)
//let videoDevice = AVCaptureDevice.position.front(for: AVMediaType.video)
var metadataOutput = AVCaptureMetadataOutput()
var delegate:AVCaptureMetadataOutputObjectsDelegate? {
    get{
        return self.forwardDelegate
    }
    set(v){
        self.forwardDelegate = v
        self.metadataOutput.setMetadataObjectsDelegate(v, queue: DispatchQueue.main)
    }
}
var forwardDelegate:AVCaptureMetadataOutputObjectsDelegate?
var preview:UIView?
var previewLayer = AVCaptureVideoPreviewLayer()
let qrView = UIView()

//info.plist Privacy - Camera Usage Description:String
func setupCamera( view:UIView, borderWidth:Int = 1, borderColor:CGColor =  UIColor.red.cgColor ){
    
    self.preview = view
    
    //デバイスからの入力
    do {
        let videoInput = try AVCaptureDeviceInput(device: self.videoDevice!) as AVCaptureDeviceInput
        //let videoInput = try AVCaptureDeviceInput(device: device)
        self.captureSession.addInput(videoInput)
    } catch let error as NSError {
        print(error)
    }
    //出力
    self.captureSession.addOutput(self.metadataOutput)
    
    //読み込み対象タイプ
    self.metadataOutput.metadataObjectTypes = [AVMetadataObject.ObjectType.qr]
    
    //カメラ映像を表示
    self.cameraPreview(view)
    
    //認識QRの確認表示
    self.targetCapture( borderWidth:borderWidth, borderColor: borderColor )
    
    // 読み取り開始
    self.captureSession.startRunning()

}
   
private func cameraPreview( _ view:UIView ){
    //カメラ映像を画面に表示
    self.previewLayer = AVCaptureVideoPreviewLayer(session: self.captureSession)
    previewLayer.frame = view.bounds
    previewLayer.videoGravity = .resizeAspectFill
    view.layer.addSublayer(previewLayer)
}

private func targetCapture(borderWidth:Int, borderColor:CGColor){
    self.qrView.layer.borderWidth = CGFloat(borderWidth)
    qrView.layer.borderColor = borderColor
    qrView.frame = CGRect(x: 0, y: 0, width: 0, height: 0)
    if let v = self.preview {
        v.addSubview(qrView)
    }
}

//読み取り範囲の指定
public func readRange( frame:CGRect = CGRect(x: 0.2, y: 0.3, width: 0.6, height: 0.4) ){
    
    self.metadataOutput.rectOfInterest = CGRect(x: frame.minY,y: 1-frame.minX-frame.size.width, width: frame.size.height,height: frame.size.width)
    
    let v = UIView()
    v.layer.borderWidth = 1
    v.layer.borderColor = UIColor.red.cgColor
    if let preview = self.preview {
        v.frame = CGRect(x: preview.frame.size.width * frame.minX, y:  preview.frame.size.height * frame.minY, width: preview.frame.size.width * frame.size.width, height: preview.frame.size.height * frame.size.height )
        preview.addSubview(v)
    }
}

func delegate(_ delegate:AVCaptureMetadataOutputObjectsDelegate){
    //オブジェクトを読み込んだ時のdelegate AVCaptureMetadataOutputObjectsDelegate.metadataOutput
    self.metadataOutput.setMetadataObjectsDelegate(delegate, queue: DispatchQueue.main)
}