The Library subscribes to many streaming video sites - see a more complete listing in the Film & Videos libguide.
For video content related to Psychology, including clinical educational videos, Films on Demand is a good source for this kind of content.
Try searching relevant keywords, such as cognitive behavior therapy. You can also browse more broadly under the Subject heading of Counseling and Social Work, and the associated subheadings. Series such as The Counselling Channel includes some case studies, demonstrations of techniques or simulations of therapy sessions.