While far from optimal, I think you can absolutely learn from video under certain circumstances. I think learning the basics of something like BJJ is possible, assuming you are working with partners who enable you to test what you are learning. I also think you would need to be disciplined enough to not try to learn too much at one time.
Like others have said, it's a great supplement. I used video a ton when I started training BJJ. It was an excellent way to review techniques at home. And I'm using videos now to keep things fresh in my mind since I can't attend classes at the moment.
I can even remember watching the UFC back in the early 90s and "rolling" with some other guys who had no grappling experience. While not "mastering" anything, I was able to get good enough at a few basic techniques to pull them off against resisting opponents with no experience or similar experience. Twenty years later it made the first couple weeks of training with a real instructor a lot easier.
So really, I think the question should be a personal you instead of a general you. Can YOU learn from video? I can, and have.
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