Move Post: date info above post title

the one big error is that you do not enter the $(postTitle)
and to avoid to write always the jQuery instead of $ i do surround the code in this way – so you can use inside normal $ sign:

<script>
(function($){	
	…
})(jQuery);
</script>

and if you are not using any index you can remove that too:
( if your selectors are right – try this) :

function metaAfterTitle(){
?>
<script>
(function($){	
	$(".template-blog .post-entry").each(function(){
		var postTitle 	= $(this).find('.blog-categories.minor-meta');
		var metaInfo 	= $(this).find('.post-meta-infos');
		$(metaInfo).insertAfter($(postTitle));
	});
})(jQuery);
</script>
<?php
}
add_action('wp_footer', 'metaAfterTitle');

not that is the error – the error is in your syntax:

you Code is :
jQuery(metaInfo).insertAfter(postTitle);
and it has to be:
jQuery(metaInfo).insertAfter(jQuery(postTitle));

the other mentioned is only stylistic point of view. Instead of using on the whole code jQuery each time a $ is set – you can do it as said above.

i am a participant like you, and thats why i could not read private content area and if you prefer to hear it from a mod that needs to be improved in the code then that’s ok for me too.
You could have just tested the code – it wouldn’t have been that much work.

you can test always – even each functions via Developer Tools and the Console
just open the concerning page/post and put the pure script to the console and press return.
see video:
Vimeofilm