popupvid.io is an app that I created to help myself learn Angular. You can see an example of it above - the site lets you choose a youtube video and overlay informational graphics in the style of the VH1 Pop-Up Video series. You can then share that overlaid video with others or embed it in a website.
I might pickup work on this project again at some point, but it would definitely require a major refactor, including a migration to a new framework. In the meantime the source is available on Github.