I just wonder if there's enough published material on Éomer to justify a video? It would probably be pretty short.
Maybe include a segment on the actors who portrayed him? Karl Urban played him in the movies, but voice actors in radio dramas and video games also gave him a voice.
Eomer may have been in the Bakshi and Rankin/Bass cartoons, although he was never officially identified and had no speaking roles in those films.
Here's a Tolkien Gateway link to Eomer.