Different Background Colors (and Full Page Background Video) Options

Using a very helpful suggestion on the forum I saw from the moderator here, I was able to change the background color to Black on all of my Premium Focus-Themed Word Press site’s pages. It looks just as I hoped it would.

Now, I have uploaded a plugin for making all, or a single page (Not just the Home Page) have a video background, onto which other media and lettering etc can show.

My issue: I want most of the pages to remain a black background color, but some of them to allow the video background plugin to run. Can you tell me the specifics for how to do that? I just completely followed your directions as to where to paste the code for the black background, and so would appreciate similar, novice-friendly instructions for doing this.

The plugin is called “Easy Video Background” for WordPress from Envato.

Thanks for any guidance.