http://www.venice-days.com/film.asp?...HOSES&lang=eng
This page has a link to a press kit, with a question about the transformations. They are in the movie, but they're done through editing. The director thought that using makeup or CGI would be cheap and unrealistic (so instead he used film editing, something with no real world equivilent ¯\_(ツ)_/¯). That said, he does say the movie uses some CGI, but doesn't say what it's used for.