She leaves her husband through a camera.

[Nodai]

I watched a movie some years ago about a woman who "records" herself leaving her husband. It started out with him getting up for work, cheating on her with a coworker or something, and coming home to find his TV and a camera facing his chair. It was very suspenseful as it led up to realizing she recorded it with his neighbor, a man he hates with a passion. I don't want to spoil it so I left out some things, but the movie is one of a kind so realizing it shouldn't be a problem for a movie buff. Also note: It was on Netflix at one point, so it's probably not Indie, It might be a UK movie, though I'm not sure of the accent.

[316zombie]

alexandra's project is the one i think you're looking for.
hope that helps!