WikiTube is a nice Chrome extension that adds relevant videos to Wikipedia pages. With the extension installed and enabled just visit a Wikipedia entry and a set of YouTube videos related to the entry will appear above the article. The screenshot below captured what I found when I visited the Wikipedia entry for Larry Bird.

Applications for Education 
WikiTube could be helpful to students when they’re in need of a better explanation or a visual explanation of topic that they’re reading about on Wikipedia. For example, if a student is reading about the Pythagorean Theorem on Wikipedia they’ll quickly find an explanatory video on the page if they have WikiTube installed.