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import cv2
import numpy as np

img = cv2.imread('maze.png',0)
size = np.size(img)
skel = np.zeros(img.shape,np.uint8)

ret,img = cv2.threshold(img,80,255,0)
element = cv2.getStructuringElement(cv2.MORPH_CROSS,(5,5))
done = False

while( not done):
    eroded = cv2.erode(img,element)
    temp = cv2.dilate(eroded,element)
    temp = cv2.subtract(img,temp)
    skel = cv2.bitwise_or(skel,temp)
    img = eroded.copy()

    zeros = size - cv2.countNonZero(img)
    if zeros==size:
        done = True

    cv2.imwrite('maze_skel.png', skel)
cv2.imshow("maze",skel)
cv2.waitKey(0)
cv2.destroyAllWindows()

Here is output