Rewind Pendant: a wearable that captures what you say and hear

There's a short short by Ted Chiang about this concept (he also wrote Stories of Your Life which the movie Arrival is based off of). In the story, a father records his family's entire life but he realizes that he was just living vicariously through the camera instead of truly being present in the moment.

Another related work is S1E3 of black mirror, The Entire History of You.

An eye implant that records all audio and video becomes becomes the norm for people, almost like how ubiquitous cell phones are.

The episode explores the social repercussions it can cause. Probably my favorite episode of the whole series.