For anyone who wants to learn how Cinematic Intro came about; this is very old, may not work and also has no where near the capability of Cinematic Intro. However if you cannot afford Cinematic Intro then try this out!
simple really, fill out the config and now you can call the function(s) provided in the file on the client at any point to initiate it. you can also end it at any point.
https://www.gmodstore.com/scripts/view/2838/cinematic-intro -- clout