This Video Gallery feature runs on about 200 sites and was a complete overhaul of the previous version of the feature.
This prototype is now live and used by staff at 200+ schools to upload video. The visual look is intended to be similar to the existing CMS. This feature was tested pretty extensively and changes were made pre- and post-launch to account for user understanding of where videos appear, anti-patterns used in other parts of the CMS (i.e. confusion over whether it was okay to press save while the video was uploading), and more.
Note: There's a faded out menu in the upper left to flip through pages which is part of a small framework I built for prototyping that rewrites URLs, uses various templates, allows for notes and navigation, etc.