Thanks for asking! We have compiled numerous resources concerning best practices, use cases, and research on implementing video-based classroom observation practices.
Many schools using TALENT develop specified privacy policies regarding recording in classrooms, and detailing the release of video into the public domain. For researched-backed tips, explore the 'Cultivating Trust in Video Observations' section of Harvard's Best Foot Forward: Video Observation Toolkit.
Check the appendices for the section to find privacy-related questions, commonly accepted security practices, and consent form templates. You can find this toolkit, and more resources at http://www.torsh.co/resources.