Hi Guillermo,
Solution 1:
Use this PHP code. Adding PHP: https://docs.generatepress.com/article/adding-php/
add_filter( 'generate_do_block_element_content', function( $content ) {
global $wp_embed;
$content = $wp_embed->autoembed( $content );
return $content;
} );
Solution 2:
Go to this website, paste the video URL there, and copy the generated Embed code.
https://embedresponsively.com/
Then paste the embed code to an HTML block in the block element.