.swift

func captureOutput(_ output: AVCaptureOutput, didOutput sampleBuffer: CMSampleBuffer, from connection: AVCaptureConnection) {
        
        if let barcodeDetector = self.barcodeDetector {
            
            let visionImage = VisionImage(buffer: sampleBuffer)
            
            barcodeDetector.detect(in: visionImage) { (barcodes, error) in
                
                if let error = error {
                    print(error.localizedDescription)
                    return
                }
                
                for barcode in barcodes! {
                    print(barcode.rawValue!)
                     self.barCodeRawValueLabel.text = barcode.rawValue!
                }
            }
        }
    }