Is it permissible to record videos to teach mathematics and physics in foreign languages, appear in them, and publish them for a fee, and what is the ruling on the money earned from this work?

There is no objection to creating video or audio clips to teach mathematics lessons and selling them, and it is permissible to benefit from what is earned from them. The intention should be to spread beneficial knowledge, and there is no harm thereafter in seeking Allah's bounty and taking payment.