I am not your Negro / Magnolia Pictures ; Amazon Studios ; Velvet Film, Inc. (USA), Velvet Film (France) present in coproduction with Artémis Productions, Close Up Films ; in coproduction with ARTE France, Independent Lens, RTS Radio Télévision Suisse, RTBF (Télévision belge), Shelter Prod ; written by James Baldwin ; directed by Raoul Peck ; produced by Rémi Grellety, Raoul Peck, Hébert Peck ; a Raoul Peck film. (OCLC #976436785)

RDA defines the on-screen participant relationship designator to mean:

An agent contributing to an expression of a nonfiction moving image work by taking an active role as a participant. Appearance on screen to provide contextual or background information is excluded.

The record for this documentary includes designated several people this way:

    700 1_ ǂa Baldwin, James, ǂd 1924-1987, ǂe screenwriter,
        ǂe on-screen participant.
    700 1_ ǂa Belafonte, Harry, ǂd 1927- ǂe on-screen participant.
    700 1_ ǂa Brando, Marlon, ǂe on-screen participant.
    700 1_ ǂa Cavett, Dick, ǂe on-screen participant.
    700 1_ ǂa Bush, George W. ǂq (George Walker), ǂd 1946-
        ǂe on-screen participant.

James Baldwin : the price of the ticket / a Karen Thorsen production in association with Maysles Films, Inc. & WNET, New York ; directed by Karen Thorsen ; produced by Karen Thorsen & William Miles ; written by Karen Thorsen, Douglas K. Dempsey. (OCLC #25112025)

This title is biographical in nature, as indicated in the subject headings:

600 10 ǂa Baldwin, James, ǂd 1924-1987.
650 _0 ǂa African American authors ǂy 20th century ǂv Biography.
650 _0 ǂa Civil rights workers ǂz United States ǂv Biography.

If this were a Book record (for example, with Type: a for Language material and BLvl: m for monograph), there would be a position in the fixed fields used to designate this (Biog = 008/34, 006/17); as this is a Visual materials record, fixed fields are used to record other data specific to the format, such as running time (in minutes), and technique (live action or animated?).