The Page Section or ROW background video should show on mobile devices also.
Things to consider:
Make this changes in the parent theme files.
Everytime you update the theme, you will have to make these changes again.
Edit core-scripts.6.1.4.js file present in themes/jupiter/assets/js folder.
Go to line 7658 and comment the code from line 7658 - 7662.
Edit components-full.6.1.4.css file present in themes/jupiter/assets/stylesheet folder.
Go to line 9439 and comment the code from line 9439 - 9441.
Clear the plugin cache (if any) and clear the browser cache and see if the background video works on mobile.