import cv2 as cv
import numpy as np

img = cv.imread('data/pic2.jpg')
cv.imshow('pic2', img)

blank = np.zeros(img.shape[:2], dtype='uint8')
mask = cv.circle(blank, (img.shape[1] // 2, img.shape[0] // 2), 70, 255, -1)
masked_image = cv.bitwise_and(img, img, mask=mask)
cv.imshow('result', masked_image)

cv.waitKey(0)
