Schools may allow you to review evidence including video evidence as part of the student disciplinary review process. Check to see whether the school has a video surveillance policy or if the issue is addressed in the school student discipline policy.
If you are not allowed to view the videotape, you may want to make a formal request for access to the video as a student record. The Family Educational Rights and Privacy Act provides rights to access educational records and generally includes video recordings in its definition of educational records.