Cinema Verite

Cinéma vérité (/ˈsɪnᵻmə vɛrᵻˈteɪ/; French: [sinema veʁite]; "truthful cinema") is a style of documentary filmmaking, invented by Jean Rouch, inspired by Dziga Vertov's theory about Kino-Pravda and influenced by Robert Flaherty’s films. It combines improvisation with the use of the camera to unveil truth or highlight subjects hidden behind crude reality.

It is sometimes called observational cinema, if understood as pure direct cinema: mainly without a narrator's voice-over. There are subtle, yet important, differences among terms expressing similar concepts. Direct Cinema is largely concerned with the recording of events in which the subject and audience become unaware of the camera's presence: operating within what Bill Nichols, an American historian and theoretician of documentary film, calls the "observational mode", a fly on the wall. Many therefore see a paradox in drawing attention away from the presence of the camera and simultaneously interfering in the reality it registers when attempting to discover a cinematic truth.

Cinéma vérité can involve stylized set-ups and the interaction between the filmmaker and the subject, even to the point of provocation. Some argue that the obvious presence of the filmmaker and camera was seen by most cinéma vérité filmmakers as the best way to reveal the truth in cinema. The camera is always acknowledged, for it performs the raw act of filming real objects, people, and events in a confrontational way. The filmmaker's intention was to represent the truth in what he or she was seeing as objectively as possible, freeing people from any deceptions in how those aspects of life were formerly presented to them. From this perspective, the filmmaker should be the catalyst of a situation. Few agree on the meanings of these terms, even the filmmakers whose films are being described.

...
Wikipedia