I have uploaded a few presentations and talks on video which would cheer up Magna Carta articles, some are quite 'non-academic friendly' for readers who might be daunted by a long encyclopaedia article (videos play back without having to leave a Wikipedia article). They are currently in https://commons.wikimedia.org/wiki/Category:Magna_Carta but will probably be moved to a sub-category in a while. The lectures might be helpful for those thinking of improving articles and are looking for a quick guide to issues and interpretations.
Of particular interest are a video from the British Library https://commons.wikimedia.org/wiki/File:Four_surviving_Magna_Carta_to_be_brought_together_for_the_first_time_in_history.webm and a friendly one from Parliament https://commons.wikimedia.org/wiki/File:Magna_Carta_and_the_Emergence_of_Parliament.webm.
These are uploaded thanks to a YouTube download/upload script I put together for a WikiprojectMed request. If there are others on YouTube you find with a CC-BY licence, drop me a link by email and I'll get around to taking a look. Unfortunately handling video remains a challenge for contributors, so I think my uploads are the first videos on Commons for this topic.
Fae