Take the URL to a video (e.g. YouTube or the page it is embedded in) or a local video file and play it via the app. What's special is that thanks to the picture-in-picture mode of Windows 10, you can watch the video on the side while doing your actual tasks. You can also change the playback rate and of cause watch it in full screen - if you have the time :)
This is only the beginning, with time more functions will be added. If you have an idea (or problem), please write a message and I'll include it in my plans.