Mastering OpenCV 4 with Python
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Reading a video file

cv2.VideoCapture also allows us to read a video file. Therefore, to read a video file, the path to the video file should be provided when creating the cv2.VideoCapture object:

# We first create the ArgumentParser object 
# The created object 'parser' will have the necessary information
# to parse the command-line arguments into data types.
parser = argparse.ArgumentParser()

# We add 'video_path' argument using add_argument() including a help.
parser.add_argument("video_path", help="path to the video file")
args = parser.parse_args()

# Create a VideoCapture object. In this case, the argument is the video file name:
capture = cv2.VideoCapture(args.video_path)

Check out read_video_file.py to see the full example of how to read and display a video file using cv2.VideoCapture