import cv2

cap= cv2.VideoCapture(0)

while(True):
    ret,frame = cap.read()
    w =frame.shape[1]
    h =frame.shape[0]
    w=w/2
    h=h/2
    print(frame.shape)
    p1=(w-50.0,h-50.0)
    p2=(w+50.0,h+50.0)
    color = (255, 0, 0) 

    cv2.rectangle(frame,p1,p2,color,2)        
    cv2.imshow("Kamera",frame)
    

    if cv2.waitKey(1)==ord("e"):
        break


cap.release()
cv2.destroyAllWindows()