Easy way to find out. Do the video course and video testing, then go out and enter a tournament. Point fighting, full contact, submission fighting, your choice.
If your successful, I'd do a video football course and then go try out for the Raiders.
The likelyhood that you can develop baseball, football, hockey, boxing, martial arts, or wrestling skills from video instruction is next to impossible. All of these activities require "live" opponants of various skill levels to train with and against, for hundreds if not thousands of hours.
Video can help a already skilled martial artist learn new techniques. But these techniques have to be taken back to the school and practiced on "live" training partners.
Video is also a good training aid for "homework" when you need to remember a kata or technique after the class is over, and your practicing it at home.