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Here is code:

#!/usr/bin/env python35
#OpenCV 4.0.1, Raspberry pi3B/+, IDE 3.5.
#Date: 4th March, 2019

import cv2
import numpy as np

img1 = cv2.imread('ralph1.jpg')
overlay_img1 = np.ones(img1.shape,np.uint8)*255
img2 = cv2.imread('mainlogo.png')
rows,cols,channels = img2.shape
overlay_img1[0:rows, 0:cols ] = img2
img2gray = cv2.cvtColor(overlay_img1,cv2.COLOR_BGR2GRAY)
ret, mask = cv2.threshold(img2gray,220,55,cv2.THRESH_BINARY_INV)
mask_inv = cv2.bitwise_not(mask)
temp1 = cv2.bitwise_and(img1,img1,mask = mask_inv)
temp2 = cv2.bitwise_and(overlay_img1,overlay_img1, mask = mask)
cv2.imshow('Temp2', temp2)
result = cv2.add(temp1,temp2)
cv2.imshow("Result",result)
cv2.imwrite("Result.jpg",result)
cv2.waitKey(0)
cv2.destroyAllWindows()

Output: