I made this screencast to help students and teachers see how to use the idea of screencasting with Google Slides.
It is a very easy way to be able to record your voice talking through some slides, and can be used for digital storytelling as well as straightforward presentation.
Screencastify does have a handful of settings and permissions to engage in, but that's just the first time you use it, and this is paired with some nifty screen annotation features that other screencasting Chrome extensions don't have.