PresentationTube is a non-profit that has actually offered a totally free service to instructors for several years. That service is the ability to tape-record video discussions based on PowerPoint pdfs and files. Just recently, PresentationTube released a Chrome extension that lets you develop video lessons in your web internet browser..

PresentationTubes Chrome extension will let you tape-record while talking over your PowerPoint slides or a PDF. You can record with your cam turned on or you can pick to just tape your voice discussing your slides or PDF. While youre tape-recording you can draw on the screen, include text notes to the screen, and emphasize text on the screen..
When you have actually completed tape-recording a discussion with PresentationTubes Chrome extension you can upload it directly to the PresentationTube website where you can then publish it publicly or keep it unlisted. Similar To Google Docs, if you make your PresentationTube unlisted then only people who have the direct link to it can see it..
Applications for Education.
PresentationTubes Chrome extension could be a great one for anybody who is looking for a new, much easier method to develop video lessons based on their existing slides. Sadly, it just deals with PowerPoint or PDFs at this time. Ideally, in the future there will be support for Google Slides. In the meantime you can always download your Google Slides as PPT or PDF to use with PresentationTube.