@objc func buttonUp(_ sender: UIButton) {

    toCam.transform = CGAffineTransform.identity.scaledBy(x: 1, y: 1)
    toCam.backgroundColor = .yellow

    segue()
}

func segue() {
    performSegue(withIdentifier: "GoToCam", sender: self)
}

class goToCamAnimCustom: UIStoryboardSegue {

override func perform() {
    scale()

}

func scale() {

    guard let destinationView = self.destination.view else {
        // Fallback to no fading
        self.source.present(self.destination, animated: false, completion: nil)
        return
    }

    destinationView.alpha = 0
    self.source.view?.addSubview(destinationView)

    UIView.animate(withDuration: CATransaction.animationDuration(), animations: {
        destinationView.alpha = 0.5
    }, completion: { _ in
        self.source.present(self.destination, animated: false, completion: nil)
    })

}