Fr normal daily classes a student would want to select a canonical performance by a grandmaster. Were a master, perhaps from another martial art, coming to teach a special seminar practicing using that material wuld be indicated.
The picture is from whatever video is set as the student’s default broadcast. In this case, a very old but exemplary movie of Grandmaster Chen Xiaowang doing the kwan dao set. The three listboxes across the bottom allow on to select a different art, style and broadcast video. The default can be changed by clicking the Update philleme. Clicking the Play philleme would just play this video only. Clicking the Camera philleme allows one to choose which camera is view. The preference would be a camera filming the student.