How do you cite from a lecture using Chicago citation style?

The 15th edition of the Chicago Manual of Style says that you can cite movies like books with the addition of the type of medium.

Scenes are treated like chapters and should be referred to by name or number. Extra commentary (not part of the movie) that is included is cited by the author and title.

Screenwriter. Movie Title. Media type. Directed by Director. Place of production: Producer, year of release.

Here's an example:

The Ad and the Ego. VHS. Directed by Harold Boihem. Philedelphia, PA: Parallax Pictures, Inc., 2001.

In this example I used a documentary, thus there is no screenwriter.

With no screenwriter, for in text citations you can use an abbreviation of the title (but clarify it first).

EX: "The film The Ad and the Ego (A&E) covers the ways advertising is affecting our national systems."

If you are using a specific scene, put it first:

"Scene Name." Screenwriter. Movie Title. Media type. Directed by Director. Place of production: Producer, year of release.

Hope this helps!