A sometimes hard to watch video montage of recent and not so recent incidents from the NYT:
Those videos, all involving white officers and black civilians, have become ingrained in the nation’s consciousness — to many people, as evidence of bad police conduct. And while they represent just a tiny fraction of police behavior — those that show respectful, peaceful interactions do not make the 24-hour cable news — they have begun to alter public views of police use of force and race relations, experts and police officials say.

Videos have provided “corroboration of what African-Americans have been saying for years,” said Paul Butler, a professor at Georgetown University Law School and a former prosecutor, who called them “the C-Span of the streets.”
Link:http://www.nytimes.com/2015/07/31/us...f-police.html?

The article is also worth reading about body-worn and vehicle video systems are not a magic solution.