import cv2
cap = cv2.VideoCapture(0)
fourcc = cv2.VideoWriter_fourcc(*'XVID')
videowriter = cv2.VideoWriter("capture.avi", fourcc, 25, (640, 480));

while (True):
    ret, frame = cap.read()
    videowriter.write(frame)
    cv2.imshow('Video', frame)    
    
    if cv2.waitKey(1) == 27:
        break    
 
cap.release()
videowriter.release()  
cv2.destroyAllWindows()