Revolution Slider is a plugin with which you can build responsive sliders with text layers, video layers, image layers etc. To get a Revolution Slider into a page, add a Revolution Slider module/element and choose the slider you created by the use of that plugin. How to create a revolution slider is explained in here:
Revolution Slider documentation can be found here: Slider Revolution Documentation
Adding a slider to a page with Elementor
Add a Revolution Slider element and select your slider.