In the book, Krum attacks Cedric Diggory in the maze with the Cruciatus Curse. In the film, he tries to kill Diggory. ... During this time, Harry witnessed his eyes being clouded, which was implied to be the reason why he deduced Krum's bewitched status in the film.

What happened to Fleur in the maze?

To get the other champions out of the way, Crouch used Moody's magical eye to locate Fleur in the maze and stun her, though she managed to scream once before it hit her. ... Fleur left Hogwarts the day after with her family, saying goodbye to Harry and Ron.

Is Viktor Krum possessed in the maze?

Yes, this exactly. Barty, as the transfigured Moody, patrolled the maze as a prof, thus was able to cast Imperious on Krum unbeknownst to others to ensure that it was Harry that got to the cup (portkey).