cv2_capture_test.py

import argparse
import cv2

helpText = "'Esc' to Quit"

def parse_args():
    parser = argparse.ArgumentParser(description="CV2 Video Capture Test")
    parser.add_argument("--vid", dest="video_dev",
                        help="video device # of USB webcam (/dev/video?) [1]",
                        default=0, type=int)
    args = parser.parse_args()
    return args

if __name__ == "__main__":
    args = parse_args()
    print("Called with args:")
    print(args)
    cap = cv2.VideoCapture(args.video_dev)
    
    while(True):
        ret, frame = cap.read()
        cv2.putText(frame, helpText, (11,20), cv2.FONT_HERSHEY_PLAIN, 1.0, (32,32,32), 4, cv2.LINE_AA)
        cv2.putText(frame, helpText, (10,20), cv2.FONT_HERSHEY_PLAIN, 1.0, (240,240,240), 1, cv2.LINE_AA)
        cv2.imshow('frame', frame)
        if cv2.waitKey(1) & 0xFF == 27:
            break
    
    cap.release()
    cv2.destroyAllWindows()