Is it legal for teachers to send student videos to the group?

It is not illegal to teach as a proper homework, but it is illegal to infringe on students' portrait rights. It is not illegal for teachers to distribute students' videos to the group for proper work and teaching, and it is illegal to use portraits that have been published by portrait owners within the necessary scope. Those who do not meet the reasonable implementation conditions of portraits are illegal acts that infringe on students' privacy. Natural persons have the right to portrait, and have the right to make, use, make public or permit others to use their own portraits according to law.