Video Under Header

Hi All.
First and foremost, I appreciate any suggestions. I am trying to add a full width video directly under my header that people would see as soon as they visit the site. They’d then be able to continue to scroll down the page and onto other content.

I can’t seem to figure it out. I purchased this plugin:

https://codecanyon.net/item/easy-video-background-wp/8858370

And it works, but It fills the entire page under my header and I can’t scroll or add additional content. Ironically, their “Live Preview” shows just what I want to do but their plugin doesn’t do it.

https://preview.codecanyon.net/item/easy-video-background-wp/full_screen_preview/8858370?_ga=2.87471386.367676730.1510066514-291384302.1510066514

I am hoping someone has some experience with this and can give me a few pointers.

Thank you!