Page Hero Background Video - Background

Hello,

I managed to show a local background video with a header element.

I do not understand this part, however:

<div class="background-video-content">
    Your Element content in here.
</div>

Should the text in there be an overlay over the video or can I make another element and that gets combined with the video? With using as it is, the text just shows up under the video.

Thanks a lot,
Stephan