I have think this show installation of extensions with more info for example which ones can improve site speed and performance, because most of them say No Info when you hover mouse over them.
Thank you anyway!
p.s. hope you get well soon, long life to you.
That particular video walkthrough belongs to Web Hosting with cPanel. In web hosting (Linux with cPanel) environment, We have limited access and resources. If you're on a virtual private server, Then you probably have complete access to install PHP extensions and version.
In case, If you on VPS, Use Easy apache 4 to install PHP Extensions.