It is best practice to make all speakers aware of live streams or recordings before an event. A comfortable speaker performs much better in front of the camera. We do not require written permission from all speakers. All participants not affiliated with Cornell should sign a release.
When Cornell faculty speak on behalf of the university, their participation = approval. This is especially true when the program is about their work at Cornell. It also holds true when the appearance is at a public event in their professional capacity. The same goes for administrators speaking about their specialized areas of expertise.