Blog post video embed code - fullscreen

In the wix blog posts I put video from an external server in the form of embed code. But I can’t enter the fullscreen function because the corvid code is for html elements and this is as post. How to make fullscreen video in such a situation ??

Wix Blog is an app, there is nothing you can do with code that will change the way the videos are set, that is done through the Wix Blog app settings.
https://support.wix.com/en/article/adding-an-image-gif-or-video-to-a-post-in-the-new-wix-blog

Apart from the fields already for the Wix Blog collection, you can’t do much with it.
https://support.wix.com/en/article/corvid-wix-blog-posts-collection-fields

thanks