Dissertations and theses are the lengthy papers that people write to complete Masters or Doctoral programs; therefore, dissertations and theses on education-related topics can also be useful as we investigate a concept or idea.
Generally, researchers and scholars use these resources to understand or investigate their topic, but they don't use someone else's graduate work as a source for their own work. Instead, they use the references in a dissertation or thesis to further investigate the published and peer-reviewed scholarship on concepts.
However, you have to cite a dissertation or thesis if you use that author's ideas in your own work!
While we can find and encounter streaming video in many places on the internet, the Libraries subscribe to a resource that is focused on academic video only -- so, these videos are more appropriate for use in your assignments and classes:
