Exclude single page from permalink rule

It’s a complex question. First of all – its works “OK”, from the point of user with no javascript and google-bot. I would suggest fixing this situation in a different way, rather then using page and subpages:

1. Create, not a page but post type video with characteristics:

   1. Non-Public
   2. Publicly queryable
   3. No Rewrites

2. Add Query Rule

add_action( 'init', function() {
    add_rewrite_rule( '^videos/?', 'index.php?post_type=video', 'top' );
});

3. Add Custom Parse Query filter.

add_action( 'init', function(){
    if ( is_admin() )
        return;
    add_filter( 'parse_query', function( WP_Query $wp_query) : WP_Query {
        if ( 'video' === $wp_query->get('post_type')) {
            $wp_query->set('nopaging', true);
        }
        return $wp_query;
    });
});

And its done. Well, not really done. You will need to generate some data attributes for videos on your page-app.