How to Create a simple application which draw a circle on an image wherever you click on it. 

import cv2
import numpy as np

black_image = np.zeros((500, 700, 3), np.uint8)
def draw_circle(events, x, y, flags, param):
    if events == cv2.EVENT_LBUTTONUP:
        cv2.circle(black_image, (x, y), 90, (0, 0, 255), 3)
cv2.namedWindow('window')
cv2.setMouseCallback('window', draw_circle)
while True:
    cv2.imshow('window', black_image)

    if cv2.waitKey(1) == 27:
        breakcv2.destroyAllWindows()


















































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