Well, the easiest way (and the way you are supposed to do it) is by using our
Slideshow particle. You have the video as a background and your have the text above it.
Or the absolutely easiest way is by using
Revolution Slider or
Layer Slider.
You can also create a custom solution, which involves some CSS code that needs to be written by you.
Here, have a look at
this discussion. It explains everything in great details.
But please, do take your time to read the whole discussion and to watch the video that I recorded there.