Thanks for your points. Very valid when you are demoing/presenting to a live audience. However, I think I should have clarified in my post that I am not presenting to a live audience. Rather, I just want to use a Presentation software to export a video (or I might just screen record the presentation itself if an export to video feature is not available) and then add a voice over on top of it.
Also, I am not going to screenshot code. Rather will record videos (using Loom) and speed it up as I feel even coding live can get boring pretty quickly if there is a lot to code anyways. Voice over would work really well in this case as well.
These videos would be part of the documentation that I'll be providing my customers with. For those who prefer watching videos over reading lengthy documentation. That's the idea.