How to do it...

Here are the steps we need to execute in order to complete this recipe:

1. First, we create a camera capture object, as in the previous recipes, and get the frame height and width:

import cv2
capture = cv2.VideoCapture(0)
frame_width = int(capture.get(cv2.CAP_PROP_FRAME_WIDTH))
frame_height = int(capture.get(cv2.CAP_PROP_FRAME_HEIGHT))
print('Frame width:', frame_width)
print('Frame height:', frame_height)

2. Create a video writer:

video = cv2.VideoWriter('../data/captured_video.avi', cv2.VideoWriter_fourcc(*'X264'),
                        25, (frame_width, frame_height))

3. Then, in an infinite while loop, capture frames and write them using the video.write method:

while True:
    has_frame, frame = capture.read()
    if not has_frame:
        print('Can\'t get frame')
        break
        
    video.write(frame)
        
    cv2.imshow('frame', frame)
    key = cv2.waitKey(3)
    if key == 27:
        print('Pressed Esc')
        break

4. Release all created VideoCapture and VideoWriter objects, and destroy the windows:

capture.release()
writer.release()
cv2.destroyAllWindows()