Use cookie information to determine visitor country?

The website I run already use MaxMind to get the visitor country. This is exposed for the user and they can even change it in their settings if the country is determined wrong. This information is stored in a cookie.

Is it possible to make Piwik use this information from that cookie when storing information about the visitors country? (It is of course using ISO standard).

Or make my website send Geo info to Piwik?