Video+Audio record using Beacons

Using beacons, for example on a whiteboard or attached to projector screen, video record as the handwritten (or typed notes/powerpoint) appear on the board. Audio would be helpful in a situation like a STEM class, where a professor would be explaining the concepts as they evolve, or where students ask questions.
The recording could be continuous or with specific loop timeframes for the sake of memory and storage.
A human figure, or hand, writing on the board would appear as a blank silhouette when the "recording" is saved, for privacy purposes.
Within the app, one could have the option of "screenshot" frames that contain the information needed and saved as a PDF like the usual Rocketbook files.
This allows a teacher to explain notes, record the conversations in class, distribute lecture notes that contain the video/audio in a simple format.
Rocketbook already has the ideaboard, however recording video/audio would allow be much more versatile for teachers and students.