In Stage 1, we heard that watching a video by itself isn’t often helpful.
I think the best videos for Professional Learning have multiple components. I personally like a video in which a teacher talks about the background/context that brought him or her to the inquiry addressed in the video. Secondly, I like to see the teacher implementing the strategy/system/concept with his/her students. Finally, the best professional learning for me is learning that keeps me honest. Teachers need a reflective/responsive component: reflective writing, an action plan, an inquiry, a logic model--whatever mode will hold him/her to trying the practice is critical.
I think making the video" interactive," at least with the action component--really has impact for the teacher to bring the practice to action. I also think an online community where folks can asynchronously debrief the experience with one another, or offer a thinking partner ear to others watching the video and implementing the strategy would have much longer effect--and would help build a PLN centered around the video content.
Districts (or states) could easily implement the system using video of their own teachers/students, and house that work on their district/state platform. The key, however, would be making it polished and user-friendly, and my experience with those platforms is that they are neither. Think about it--if districts could create a virtual space for these videos, it would allow PLCs to watch the videos and discuss together as embedded PD, and then the active component could be an action plan for the team.