PresentationTube is a non-profit that has provided a complimentary service to instructors for many years. That service is the capability to record video presentations based on PowerPoint files and PDFs. Just recently, PresentationTube launched a Chrome extension that lets you produce video lessons in your web browser..

PresentationTubes Chrome extension will let you tape-record while talking over your PowerPoint slides or a PDF. You can tape-record with your web cam turned on or you can pick to just tape your voice discussing your slides or PDF. While youre recording you can make use of the screen, include text notes to the screen, and emphasize text on the screen..
When you have completed recording a discussion with PresentationTubes Chrome extension you can publish it directly to the PresentationTube site where you can then release it publicly or keep it unlisted. Just Like Google Docs, if you make your PresentationTube unlisted then just people who have the direct link to it can view it..
Applications for Education.
PresentationTubes Chrome extension might be a great one for anybody who is looking for a new, easier way to create video lessons based on their existing slides. In the meantime you can always download your Google Slides as PPT or PDF to utilize with PresentationTube.