Piwik implementation?

I saw this comment from James, that they have integrated Piwik in some project:
https://premium.wpmudev.org/forums/topic/statpress-reloaded-and-multi-db-not-working#post-9860

I though that it can be done this way:
- runing piwik on one server
- using API when blogs are created to get user and pass
- using one of the plugins on wordpress.org with the user and pass

Has anybody else already done it? Any experience?