Setting device orientation in vision image request handler

orientationForVision.swift

 let exifOrientation = self.exifOrientationForCurrentDeviceOrientation()
        
        guard let requests = self.trackingRequests, !requests.isEmpty else {
            // No tracking object detected, so perform initial detection
            let imageRequestHandler = VNImageRequestHandler(cvPixelBuffer: pixelBuffer,
                                                            orientation: exifOrientation,
                                                            options: requestHandlerOptions)
         
    func exifOrientationForDeviceOrientation(_ deviceOrientation: UIDeviceOrientation) -> CGImagePropertyOrientation {
        
        switch deviceOrientation {
        case .portraitUpsideDown:
            return .rightMirrored
            
        case .landscapeLeft:
            return .downMirrored
            
        case .landscapeRight:
            return .upMirrored
            
        default:
            return .leftMirrored
        }
    }
    
    func exifOrientationForCurrentDeviceOrientation() -> CGImagePropertyOrientation {
        return exifOrientationForDeviceOrientation(UIDevice.current.orientation)
    }