The seminar is not "Joseph Campbell 101." It's a practical treatment on how a writer can apply Campbell's insights to their own work.
Michael Hauge and Chris Vogler are very successful Hollywood script consultants who have amplified their careers by incorporating the ideas Joseph Campbell into their work. In these recordings, they plug Campbell's monomyth structure into screenwriting story structure. Having read their books, (The Writer's Journey and Writing Screenplays That Sell), I can tell you that they do not stray far from their written material.
What is nice about this recording, is that they overlay 2 journeys, the Inner and Outer journey, into screenwriting parlance. The Outer Journey is represented by a hero's visible, outward goals. And the Inner Journey signifies the hero's personal transformation. It's a powerful combination, and worth investigating if you are studying story structure, novel structure, or screenwriting. As they walk through this material, they associate stages of the Hero's Journey with the act structure of a film, and suggest target points in the film (sometimes minutes) where the writer should introduce various events from the monomyth cycle.
If you plan to purchase this, I recommend also reading their books and Campbell's "The Hero With A Thousand Faces". If your budget is limited, start with Vogler's "The Writer's Journey." It primarily targets screenplay structure, and is easier to read than Campbell.
These recordings go into detail about the various myth stages and archetypes, but cannot cover those topics at the depth in which they are treated in their written works. The recordings offer more of a high to medium-level treatment of topics presented more in-depth in the books. This recording offers supplemental insights and the "2 Journeys" overlay that the separate books lack.
If you are unfamiliar with the monomyth cycle (also known as The Hero's Journey), or are unfamiliar with Joseph Campbell, you may find the recordings confusing because Hauge and Vogler don't spend a lot of time introducing listeners to Campbell's theories. They offer a high level overview of the stages, and then dive into how a writer can apply The Hero's Journey to a screenplay or novel. If you're in the camp of the unfamiliar, Wikipedia has a good article on "monomyth", and a web search for Joseph Campbell or "The Hero's Journey" will give you plenty of videos, articles, and diagrams to ramp you up on this subject.
If you have not seen it, I also highly recommend watching The Power Of Myth, where Bill Moyers interviews Joseph Campbell at George Lucas' Skywalker Ranch. There are YouTube clips of these interviews, and Amazon sells the DVD set for a reasonable price.