Police Foundation partnered with several other organizations (including NTOA) to create
www.LEONearMiss.org which allows self-reporting. I had not looked at i it since ny departure from the city and had to re-register with my campus email, but it might be worth looking at. I'll report back when approved for access.
When I was still relevant and provided in-service training, I would sometimes use videos to illustrate points. I frequently used a line that I stole from Calibre Press that the video footage "were moments frozen in time." I also used a line from Special Agent Fox Mulder on, of all things, a COPS/X-Files crossover that "The camera only shows one view".
I would agree that we need to be circumspect about criticizing officers, especially from our own or allied agencies. We should also emphasize the limitations of video of seeing what actually happened.
I would also use clips from entertainment media. Usually this was done to wake the class up after lunch or kill time while the roster was signed, occasionally something would be spot on.