What would you consider police brutality?
The wanton vicious beating of a person in custody, usually while handcuffed, and usually taking place somewhere between the scene of the arrest and the station house. Rodney King is the most readily available example.
See
Wikipedia (from which I lifted my definition directly) and
the Rodney King tape for a visual example. By contrast, what most people who share links of these kinds of videos and leave youtube comments do, robbing us of a fast term that describes the above, is misuse the term "police brutality" to apply virtually any example of
police misconduct and occasionally simply to effective and honest policing applied to laws that they believe to be misguided (as in the OP video) - a case of
injustice, of which police misconduct is only a small set (
which does not include the OP),
of which police brutality is only a small set.
This is a little like calling all of literature "nouns" until we no longer have a fast term to classify words like "bird", except more serious because we're trying to engage in pragmatic and important discourse on the nature of law and justice.