just_for_test.py

import cv2

cap = cv2.VideoCapture(0)

fourcc = cv2.VideoWriter_fourcc(*'XVID')
out = cv2.VideoWriter('output.avi', fourcc,20.0,(640,480))

while True:
    _, frame = cap.read()

    out.write(frame)

    cv2.imshow("", frame)

    if cv2.waitKey(1) == 27:
        cap.release()
        cv2.destroyAllWindows()
        break