That video shows a CG head and says CG face replacement. Typically sequences like this are done on a shot by shot basis and end up being a very healthy mix of

That video shows a CG head and says CG face replacement. Typically sequences like this are done on a shot by shot basis and end up being a very healthy mix of compositing, cg face replacements, CG head replacements, etc. These types of effects have been used for literally decades across a wide range of movies and have nothing to do with the recent trend and techniques of 'deep fakes'.