Students and instructors in any course that is being webcast will find their recordings at CalCentral the Class Page for the course in question:
All official students and GSIs have access to this page via the My Academics tab.
In addition, if the instructor has set up a bCourses site for the course, the site will have a CourseCapture/Webcasts tab, where the recordings will be available to anybody that has access to the site: