Attrition

Attrition, the action or process of gradually reducing the strength or effectiveness of someone or something through sustained attack or pressure. Attrition is a different kind of experimental documentary, perhaps one of the simplest forms and therefore one that has become lost in the eyes of the mass media. It's a film that is in the true sense, a pure document, a visual recording of the life of one being during the period of a year. (imdb)