The search box on the Online Video page will limit to just DVD videos (and some old VHS cassettes). The page also lists a number of streaming video databases that the library subscribed to. Below are the best choices for csocial science disciplines.
This database cross-searches several disciplinary collections of streaming videos with transcripts. Search by keyword, then narrow using the limit options on the results page. A browse option is also available. Create an account and log in for playlists and use other tools.