Consider conducting a subject word (not just a keyword) search in UC Library Search. Directors, film genres, and the titles of major films and television series can also be used in a subject search.
Examples of subject headings to try:
Motion picture industry--Africa
Motion picture producers and directors--Interviews.
Motion picture producers and directors--Mexico--Biography.
Motion pictures--Nigeria.
Bunuel, Luis--Criticism and interpretation.
Motion pictures--Korea (South)--History.