The privacy concerns on both sides are complicated enough that the American Civil Liberties Union—which ardently supports police accountability measures—recently released recommendations for wearable police cameras to "ensure they protect the public without becoming yet another system for routine surveillance of the public."Via The Atlantic Cities
The story and it's discussion of the ACLU guidelines is worth a look. For the most part, they are pretty good even if they lean more towards the protection of citizens and less about protecting cops or the capturing of evidence.
Even with concerns about government surveillance body worn police video cameras are a good thing, both for the public and for cops. The story asked "When should cops be required to wear cameras?" The answer is: all the time.