Computer-generated imagery (CGI) is the application of the field of computer graphics (CG) or, more specifically, 3D computer graphics to special effects in films, television programs, commercials, simulators and simulation generally, and printed media. They are also included in  pre-rendered “cut scenes” and intro movies and full motion videos that would be typical CGI applications. Here one of the most mind meltingly realistic CGI Video

The Most Mind Meltingly Realistic Computer Generated Imagery

Some microscopically incorrect movement will betray the artifice of the image. That is not the case here.

Source: Gizmodo