Magento 2. Change image position in list plugin

I use Magic_360 in my magento 2. It is ok, but it show it’s 360 picture first in fotorama.

I am trying to write plugin wich move this picture to the second position.

Files:
/app/code/NickNick/Magic360PositionPlugin/registration.php

 < ?php
MagentoFrameworkComponentComponentRegistrar::register(
    MagentoFrameworkComponentComponentRegistrar::MODULE,
    'NickNick_Magic360PositionPlugin',
    __DIR__
);

/app/code/NickNick/Magic360PositionPlugin/etc/module.xml

< ?xml version="1.0"?>

    
    

/app/code/NickNick/Magic360PositionPlugin/etc/frontend/di.xml

< ?xml version="1.0"?>
        


    
        
    
        

app/code/NickNick/Magic360PositionPlugin/Block/Catalog/Product/View/Gallery/Plugin.php

< ?php

namespace NickNickMagic360PositionPluginBlockCatalogProductViewGallery;

class Plugin
{
    public function aroundGetGalleryImagesJson(MagentoCatalogBlockProductViewGallery $subject, Closure $proceed)
    {
        if (get_parent_class($subject) != 'MagentoCatalogBlockProductViewGallery') {
            return $proceed();
        }

        $result = $proceed();
        //my changes here, i did not write yet
        return $result;                      
    }
}

After files was placed, I have run setup:update and setup:di:compile. But seems Magento doesn’t reach this code, and even not placed it to generated directory.