PresentationTube is a non-profit that has offered a totally free service to teachers for several years. That service is the capability to record video discussions based on PowerPoint files and PDFs. Just recently, PresentationTube released a Chrome extension that lets you create 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 with your cam switched on or you can pick to just tape-record your voice discussing your slides or PDF. While youre taping you can draw on the screen, add text notes to the screen, and highlight text on the screen..
When you have ended up taping a presentation with PresentationTubes Chrome extension you can upload it straight to the PresentationTube site where you can then publish it openly or keep it unlisted. Much like 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 an excellent one for anybody who is looking for a brand-new, simpler method to create video lessons based on their existing slides. In the meantime you can constantly download your Google Slides as PPT or PDF to use with PresentationTube.