'Image background removal using bezierPath in iOS

After searching everywhere I found there is nothing specific source available to remove the background using bezierPath. Basically I am trying to achieve a similar feature like image cutout (You can check PicsArt >> Image editor >> CutOut). In this where user can draw any shape on the image and selected area can be highlighted and the rest of the part is removed.

Here is what I am using to draw the line on image

class DrawingImageView: UIImageView {
    var path = UIBezierPath()
    var previousTouchPoint = CGPoint.zero
    var shapeLayer = CAShapeLayer()
    var isClear: Bool = false {
        didSet {
            updateView()
        }
    }
    
    override func awakeFromNib() {
        super.awakeFromNib()
        setupView()
    }

    override init(frame: CGRect) {
        super.init(frame: frame)
        setupView()
    }

    required init?(coder aDecoder: NSCoder) {
        super.init(coder: aDecoder)
    }
    
    func updateView() {
        self.shapeLayer.shadowOffset = .init(width: 1, height: 1)
        self.shapeLayer.shadowColor = UIColor.black.cgColor
        self.shapeLayer.shadowOpacity = 1

        self.shapeLayer.lineWidth = 20
        self.shapeLayer.lineCap = .round
        self.shapeLayer.strokeColor = isClear ? UIColor.clear.cgColor : UIColor.blue.cgColor
        self.shapeLayer.opacity = 0.3
        self.isUserInteractionEnabled = true
    }

    func setupView() {
        self.layer.addSublayer(shapeLayer)
        updateView()
    }

    override func touchesBegan(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesBegan(touches, with: event)
        if let location = touches.first?.location(in: self){
            previousTouchPoint = location
        }
    }

    override func touchesMoved(_ touches: Set<UITouch>, with event: UIEvent?) {
        super.touchesMoved(touches, with: event)

        if let location = touches.first?.location(in: self){
            path.move(to: location)
            path.addLine(to: previousTouchPoint)
            previousTouchPoint = location
            shapeLayer.path = path.cgPath
        }
    }
}

To cut out a selected area I tried using cropping(to:) method of CGImage. but it's not working just clearing the entire image. You can check my out below

Plain Image