To add video elements, go to "Add Section" and search for Whatmore under apps. Click on carousels, and it gets added. You can rearrange it to be your desired location.

If you can't find the apps, it's likely because your website is still using 1.0 theme, for this, apps can be integrated by using liquid code. The article for Liquid code can be found below.

You can customize the carousel to your liking, you can enable or disable the video count view, change the UI theme (square or rounded corners), primary theme color, text color, font, and font size. These changes can be device-specific, too.

After customizing as per your needs, save the theme, to ensure your changes are not lost.