I'm the proud new owner of windows 10 with office 2016. From vista, this is quite some step.
So the project:


I have a handful of powerpoint presentations created in PPT 2016. These PPT's all have presenters notes at the bottom.
The aim is to convert this PPT into a small video file with the presenters notes as an audio (text to speech) overlay as the PPT progresses slide by slide in the video.

I have found the "speech" function and can highlight text and play as audio as I build.
How can I set this function up to play during the presentation?
Then, how to make it all into a video file?

I have seen this 'end product' on YouTube, so I'm kind off hoping it is in the realm of possibility.

Any help appreciated but please be patient and explain step by step as I'm a real novice.
Thank you all in advance.