[drakeandrews]

It's considered general good behaviour to blur the faces of bystanders, license plates (and I know at least in the UK they attempted to algorithmically blur windows).

However, there are no laws involved (at least in the UK). The people involved are not the subject of the work nor do they have any reasonable expectation to privacy on the street. Windows were another issue and I do remember some outrage over it. Google said they were trying to blur it and people went "Okay" and then it died down.