Hello, i cant see the image, please attach is to the reply 🙂
1- Those pages are the actual pages you have in your wordpress installation, demo pages are already published. They are there to show you how each template works and some are there created by other plugins to allow them to work.
For example buddypress needs Register page, Activate page, Activity, Groups and Members pages
You can check it out at Settings > Buddypress > Pages
So you can delete the ones you dont want, the template ones do not worry even if you delete the page you still have the option to select that template in a new page. They are there just to show you how it looks like.
2- The video button page? Might be part of the demo pages to show you how it looks like
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