API v2 deprecated. New youtube api v3 works only with developer token and has limitation for free connections.
You can get JSON without API:
http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=ojCkgU5XGdg&format=json Or xml
http://www.youtube.com/oembed?url=http://www.youtube.com/watch?v=ojCkgU5XGdg&format=xml