thanks to the suggestions below we have EmbedVideo working on MW version 1.3.1
Deprecated: Premature access to service container [Called from EmbedVideoHooks::onExtension in /var/www/mediawiki-1.36.1/extensions/EmbedVideo/EmbedVideo.hooks.php at line 77] in /var/www/mediawiki-1.36.1/includes/debug/MWDebug.php on line 376
seems to be fixed [ we need to bang it more ] :
git clone https://github.com/StarCitizenWiki/mediawiki-extensions-EmbedVideo.git
mv mediawiki-extensions-EmbedVideo/ EmbedVideo
cd EmbedVideo
git submodule update --init