I have been summoned by quality assurance because they took videos of me walking

As long as your activities are with your doctor's encouragement to be as active as you can tolerate and you are honest about those activities, you should not have a problem. Surveillance activity checks are pretty common. If they are showing the video to your doctor, you should request a copy of it as well.  They may want to take your deposition and ask you about your activities before you are given a copy of the video and they are entitled to do so per workers' comp. law in Florida.