This feature is not included in the theme so it is not available "out of the box" . We cant give you solution here because the preparation of such functionality would take a lot of time.
We can only suggest where you can look for answers. I found something like this: https://wordpress.org/plugins/age-verify/, you can install this plugin and test it on your website but i dont how to add video landing page there.
To be honest your request requires a lot of custom work and I recommend you to find programmer for such work.
Comments
This feature is not included in the theme so it is not available "out of the box" .
We cant give you solution here because the preparation of such functionality would take a lot of time.
We can only suggest where you can look for answers.
I found something like this: https://wordpress.org/plugins/age-verify/, you can install this plugin and test it on your website but i dont how to add video landing page there.
To be honest your request requires a lot of custom work and I recommend you to find programmer for such work.
With Regards
Daniel