src4.py

import numpy as np
import cv2


img = cv2.imread('watch.jpg', cv2.IMREAD_COLOR)

px = img[55, 55]
# print(px)

# Region of image (ROI)
ROI = img[100::150, 100:150]
# print(ROI)

img[100:150, 100:150] = [255, 255, 255]

watch_face = img[37:111, 107:194]

img[0:74, 0:87] = watch_face

cv2.imshow('image', img)
cv2.waitKey(0)
cv2.destroyAllWindows()