I found it myself.
STEPS that worked for me ( in the place of "k2gmap" you can put your plugin)
1) $pluginParams = new K2Parameter($this->item->category->plugins,'','k2gmap');2) To know the syntax of the fields I Used >>print_r($pluginParams); 3) Finally to get the value I used => echo $pluginParams->_registry->k2gmaplatitude;
So the complete code is this:
$pluginParams = new K2Parameter($this->item->category->plugins,'','k2gmap');//print_r($pluginParams); echo $pluginParams->_registry->k2gmaplatitude;
Hope that helps. It took me hours of searching and testing things. In this way you can get any value from any plugin and show it inside item.php