Tech advances help film-makers but could lead to a glut of videos involving politicians or porn.

Every Hollywood actor is desperate to cling to their youth. Now, Will Smith, the star of Independence Day and Men in Black, can be 23 forever. But unlike his Botoxed peers, the secret of Smith's fresh face is a new breed of digital doppelgänger, offering unprecedented realism.

In Gemini Man, his latest blockbuster which is in NZ cinemas now, the 51-year-old actor plays a retired assassin whose younger clone is sent to kill him.

The 23-year-old Smith clone, known in the movie as Junior,

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