YouTube automatically detects locations from queries, so it's not necessary to use the advanced search options. A search for [live szeged] displays a small box with four geocoded videos that can expanded to see all the results.
Another way to find YouTube videos recorder in a country or city is to add the YouTube mapplet to Google Maps. In some cases, you can just search for a location, select "Explore this area" and then click on "More videos" to enable the mapplet.
{ via Search Engine Land }