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I found in the doc :

map_proj = cv.reg.MapTypeCaster_toProjec(map_ptr)

and there is no value return by normalize. normalise do work in place :

import cv2 as cv

img1 = cv.imread("g:/lib/opencv/samples/data/lena.jpg")
img2 = cv.imread("g:/lib/opencv/samples/data/lena.jpg")
mapper = cv.reg_MapperGradProj()
mapp_pyr = cv.reg_MapperPyramid(mapper)
map_ptr = mapp_pyr.calculate(img, img)
map_proj = cv.reg.MapTypeCaster_toProjec(map_ptr)
map_proj.normalize()

dest = map_proj.inverseWarp(img2)

I found in the doc :

map_proj = cv.reg.MapTypeCaster_toProjec(map_ptr)

and there is no value return by normalize. normalise do does work in place :

import cv2 as cv

img1 = cv.imread("g:/lib/opencv/samples/data/lena.jpg")
img2 = cv.imread("g:/lib/opencv/samples/data/lena.jpg")
mapper = cv.reg_MapperGradProj()
mapp_pyr = cv.reg_MapperPyramid(mapper)
map_ptr = mapp_pyr.calculate(img, img)
map_proj = cv.reg.MapTypeCaster_toProjec(map_ptr)
map_proj.normalize()

dest = map_proj.inverseWarp(img2)