Brightspace automatically synchronizes course roster withs Panopto to allow instructors and students access to videos. However, this process must be triggered by clicking on a link entitled Panopto Video - BRK at least one time prior to use of Panopto.
The Panopto Video - BRK link is generally located in a folder entitled Panopto Course Folder in the content section of your course, although the title may vary.
Once you have clicked this link and logged into Panopto, your permissions between Panopto and Brightspace should be synchronized for all of your Brightspace courses.