import cv2

img = cv2.imread("Cat2.jpg")

def draw_cricle(event,x,y,flags,param):
    if event == cv2.EVENT_LBUTTONDOWN:
        print("Hello")
        cv2.circle(img,(x,y),100,(0,255,0),-1)

cv2.namedWindow(winname="Popup Window")
cv2.setMouseCallback("Popup Window", draw_cricle)


while True:
    cv2.imshow("Popup Window",img)
    if cv2.waitKey(10) & 0xFF == 27:
        break

cv2.destroyAllWindows()