You have several ways to transfer data from Analytics to Campaign:
By leveraging the People core service (or Audience Manager) integration, to create/exchange segments between the apps
By setting up direct transfers, which consists in using data warehouse and FTP transfer to Campaign, as explained in this thread: Analytics data transfer to Adobe Campaign. It's very easy to retrieve files from FTP or SFPT servers to process them in Campaign (and even to automate that process via scheduled workflows).