Watch this November 2021 tutorial by Russell Stannard. The first part (6 minutes & 20 seconds) is about an amazing digital tool called "YouGlish," which allows students to manipulate YouTube videos to learn vocabulary. Then there is an internal advertisement, followed by tips about using YouTube options.
You won't know what images or phrases you YouGlish will present. Although nothing will be obscene, per-se, the administrators and parents in your school might not want the kids to see/read/hear them. So consider the community standards before using YouGlish with your students.