[Python] How to subtract the background from an image - python , opencv

How to subtract the background in a still image? IF the issue is with videos then we can use cv2.createBackgroundSubtractorMOG(). I tried to manipulate the function, but I got AttributeError

This is what i have tried:

img = cv2.imread('lena.png')
fgbg = cv2.createBackgroundSubtractorMOG2()
fgmask = fgbg.apply(img)
cv2.imwrite('{0:d}.jpg'.format(i),fgmask)


But I got this error:

AttributeError: 'module' object has no attribute 'createBackgroundSubtractorMOG2'


Any suggestion are welcome!

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