The video is an example problem for the analysis of a statically indeterminate continuous beam using the method of superposition. After calculating the reactions, the shear and moment diagrams are drawn. See below to jump around:
0:05 Problem Statement
0:33 Check Determinacy
2:48 Method of Superposition
4:37 Compatibility Relationship
7:10 Equilibrium Equations
7:49 Shear and Moment Diagrams