Who is the instructor? While many don't approve of the idea of primary instruction being through video, you have obviously found one of the IKCA's many physical schools.
The system began as a physical school and was spread through the video program. The association holds several gatherings a year to ensure that all practitioners who can attend (often they are instructors with their own school) are getting and giving quality instruction in basics, techniques et cetera.
There are countless threads on this forum and other fora regarding the topic of video training. You have a school to go to, so I'd say check it out!