They seem to be working, though as Radley Balko points out, there are a few policies yet to be defined—specifically, when and under what conditions a body-camera video will be made public. The police, naturally, say that they and they alone should decide (with the possibility of releasing videos that exonerate cops, keeping secret those that implicate cops). It seems likely that public release will have to be decided by an independent party, and the prosecutor/DA is not one of those.
Truthfully, this seems to be a win-win situation: it reduces violence against cops (and prevents lies about police abuse/harassment) and it reduces violence against citizens. Everyone wins.