require 'ex_ua'
base_categories = ExUA::Client.base_categories('ru') # Gives you array of all base categories for a given language
category = base_categories.first # Select first category (usually video)
sub_categories = category.categories # Select sub-categories of a category
example_video_category = sub_categories.first.categories.first
download_items = example_video_category.items # Here you'll have an array of download items in a given category with #load_uri

require 'ex_ua'
page = 0
per_page = 20
categories = ExUA::Client.search('futurama', page, per_page)