This is really simple plugin that allows you to preserve progress ui while control bar is hidden. Example.
Plugin is based on video.js built-in controls, so native controls, iOS, flash player are not supported.
Plugin is so simple that it's only one css file that overrides default videojs styling. To use it just include after videojs css:
<link href="//vjs.zencdn.net/4.10/video-js.css" rel="stylesheet">
<link href="videojs-youtube-progress.css" rel="stylesheet">WARNING It's important to include it AFTER original stylesheet, otherwise styling rules won't be overridden.
That's it! Be happy!