Plugin like "add media" to quicly add some pre made text.

Hi

I want to find a plugin where you can quickly add some premade text. And where you can add it easy like the standard add media box.

So lets say, I have made a section with a button and a video
And I want my client to be able to add that button and the video on every page he creates, so it’s easy for him just to paste that in and then he only have to change/add the urls in each input and not writing the whole code again.

Is there a plugin for that out there?

Sorry for my english, dont know how to describe it better.
Thanks in advance