Anyone can provide help with CMB2

I have a client who has a video embedded in the background HERO section. I want to replace it with a banner image and also add a button on it that links to video.

The old dev used CMB2 plugin for the same . Can anyone help me with the code that i need to add to make it work?

I am okay paying also if someone can assist…

Hopefully, for anyone aware of ustom meta boxes it will take just 10 minutes.