ORIENT/plugins/tps/reklama/Plugin.php

<?php namespace Tps\Reklama;

use System\Classes\PluginBase;

class Plugin extends PluginBase
{
    public function registerComponents()
    {
        return [
            'Tps\Reklama\Components\Advertisement'       => 'adverts',
        ];
    }

    public function registerSettings()
    {
    }
    public function registerPermissions()
    {
        return [
            'tps.reklama.statistics' => [
                'tab'   => 'Reklama',
                'label' => 'statistika',
                'order' => 100,
                'roles' => ['developer']
            ],
            'tps.reklama.adverts' => [
                'tab'   => 'Reklama',
                'label' => 'reklamalar',
                'order' => 200,
                'roles' => ['developer']
            ]
        ];
    }

    public function registerMarkupTags() {
        return [
            'filters' => [
                // A global function, i.e str_plural()
                'mediator' => [$this, 'absoluteMediaUrl'],
            ],
        ];
    }

    public function absoluteMediaUrl($file) {
        $original = \System\Classes\MediaLibrary::url($file);

        // modify here and return
        return Config::get('cms.linkPolicy').$original;
    }
}