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We had a couple of deaf students (brothers) here at Glasgow who brought a sign language interpreter with them to lectures. The interpreter would stand at the front, to one side, in front of the student. While the translation wasn't video-recorded, this must be a situation that's been repeated many times over in many places in the world, and I'd find it quite surprising if there was no resource gathering together sign language translations of undergraduate mathematics courses.
But even different English-speaking countries have different sign languages, don't they? So I guess that makes things more complicated.