bgimage.py

import cv2
cap=cv2.VideoCapture(0)

while cap.isOpened():
    ret,frame=cap.read()
    if ret:
        cv2.imshow("Image",frame)
        if cv2.waitKey(5)==ord('q'):
            cv2.imwrite('background.jpg',frame)
            break

cap.release()
cv2.destroyAllWindows()