as I can do to make the mod_k2_content show me the contents of a module banners.
within the code I have inserted this mod_k2_content.php
<jdoc:include type="modules" name="banner-horizontal3"/>
but clearly not taking or rather not show anything and I do inspect element shows the same code.

any suggestions?

Hi. You cannot do this in Joomla! You cannot load a module within an other using this code. Why not placing the banners module in the same position as the K2 content module and let Joomla! render it for you?

Well I already solved it, and for those who need to know how this is achieved is with a module called Modules Anywhere.
I hope it serves someone else