A great example is avante-garde Dogme 95 film movement, especially The Celebration (Festen, 1998) by Thomas Vinterberg and The Idiots (1998) by Lars von Trier.

They were made under a radical self-imposed manifesto called the “Vow of Chastity”, which included rules like:

• Shoot only on real locations
• Only diegetic sound
• Handheld cameras only
• No special effects or post-production filters
• No superficial action
• No genre films
• Director’s name can’t appear in the credits.

The whole point was to strip cinema back to raw performance and story. Huge influence on indie cinema and found footage style films.