Delayed Camera Launch When Executing Face Recognition Python* Demo Using Third Party USB Webcam

• Ran Face Recognition Python Demo in Windows:
  python ./face_recognition_demo.py -i 0 -m_fd face-detection-retail-0004.xml -m_lm landmarks-regression-retail-0009.xml -m_reid face-reidentification-retail-0095.xml --verbose -fg face_gallery
• Face Recognition Python Demo launches the camera immediately when using Logitech C270 HD Webcam and displays the output without issues.
• Face Recognition Python Demo takes 3 minutes to launch the camera and display the output when using the following webcams:
  • Logitech C925e Business Webcam
  • Logitech Brio Ultra HD Pro Business Webcam

Add OpenCV* Video I/O API backend such as Direct Show (cv2.CAP_DSHOW) in Line 147 images_capture.py

status = self.cap.open(int(input), cv2.CAP_DSHOW)