To find DVDs, streaming or other video formats in the Library catalog, use the "Advanced" search :
For example, enter an author's name, pull down the option to "author" and select "video" (or one of its subsets) as a format option
You can do the same thing with the title of a play (pull down to choose "title"). If you want to look for a specific actor in a specific play, leave the pull-down at "all fields" and enter both of the terms.