Google Slides offers a Closed Captions option. This can be used to help anyone read what is being said by the presenter or what is being said during a presentation video.
If the microphone is good enough it will also pick up any questions asked by audience members.
Closed Captioning in Google Slides can be added to the top or the bottom of the presentation. Adding the captioning to the top could be used in other ways as well. Think about having a presentation open and running above a video that doesn't have closed captioning available.
To use Closed Captions in Google Slides check out this easy to follow tutorial.
Google Slides - Closed Captions (https://bit.ly/43Q2YMg)