Rec

Rec is a 2007 Spanish found footage zombie horror film co-written and directed by Jaume Balagueró and Paco Plaza. The film stars Manuela Velasco as television reporter Ángela Vidal, who, along with her cameraman, accompany firefighters on a late-night call to an apartment building in Barcelona, where an outbreak prompts authorities to seal the building and place its occupants under quarantine.

Synopsis from Wikipedia, CC BY-SA 4.0. Everything below written here.

Poster © the film's rights holders.