I'm tracking sites by loading their Apache access logs into the database. I'm not sure what's CQ5 logs structure is, but it should be possible (tho it might require some modifications).

See here: http://piwik.org/log-analytics/how-to/

Edit: It should be noted that you will get lots of bots requests showing up when you load access logs (the regular tracker relies on javascript, which gets rid of most of the bots). I have a small awk script that cleans the access logs prior to importing them, by trying to detect bots. I can upload that if you're interested.