how to install stock camera app of nubia z9 to g4 as alternative/another camera app?

Does anyone know how to change name or package the stock rom of nubia z9 , so that we can install it to our G4?
Anyone who knows how to do it? I tried my best to search and follow instructions but nothing seems to work for me.
here is the link for the camera.apk of nubia z9 : https://drive.google.com/folderview?...Hc&usp=sharing