import cv2

cv2.namedWindow("POLARALIGN")
vc = cv2.VideoCapture(1)

if vc.isOpened(): # try to get the first frame
    rval, frame = vc.read()
else:
    rval = False
    
while rval:
    cv2.imshow("POLARALIGN", frame)
    rval, frame = vc.read()
    key = cv2.waitKey(20)
    if key == 27: # exit on ESC
        break
    else:
        cv2.circle(img=frame, center=(320, 210), radius=110, color=(0, 0, 255), thickness=3, lineType=8, shift=0)
        cv2.circle(img=frame, center=(320, 210), radius=120, color=(0, 0, 255), thickness=3, lineType=8, shift=0)
        cv2.line(img=frame, pt1=(320, 60), pt2=(320, 360), color=(255, 0, 0), thickness=2, lineType=8, shift=0)
        cv2.line(img=frame, pt1=(180, 210), pt2=(460, 210), color=(255, 0, 0), thickness=2, lineType=8, shift=0)
        cv2.line(img=frame, pt1=(220, 100), pt2=(420, 320), color=(0, 255, 255), thickness=2, lineType=8, shift=0)
        cv2.line(img=frame, pt1=(220, 320), pt2=(420, 100), color=(0, 255, 255), thickness=2, lineType=8, shift=0)        

vc.release()
cv2.destroyWindow("POLARALIGN")