Brainstorm: A team of scientists invents "the Hat", a brain/computer interface that allows sensations to be recorded from a person's brain and converted to tape so that others can experience them.
Where IIRC a scientist creates a device that can record dreams and his wife becomes totally addicted to the experience and just can't stop playing and re-playing her dreams.
I think it's in Until the end of the world but cannot swear it ; )
Good movie anyway...
And then there's the movie which is a reflection on immersive videogame as the main plot: David Cronenberg's Existenz. Existenz is considered a flop by many, but an underrated movie by quite some people too.