Check is your object's name is typed correctly, or have a space in front of the object's name. it works for me.
OysterSu
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you need the set output.connection(with: .video)?.videoOrientation before capture image
if let orientation = AVCaptureVideoOrientation(rawValue: UIDevice.current.orientation.rawValue) {
camera.output.connection(with: .video)?.videoOrientation = orientation
}