The problem with the law is that it does NOT stop people from being within 8 feet of cops in the performance of their duties. It ONLY stops people from RECORDING the cops from within 8 feet. If the people aren't recording, this law does not apply to them.
That leads to the question of why a law is needed to try to stop people from recording police, when it isn't designed to stop any other sort of interference?
As I and others have said, if being within 8 feet of police while the perform their duties is interference, make a law that criminalizes being within 8 feet. Limiting it to people who are filming seems to indicate that the filming is the real issue, not the distance.
And if there are laws covering interference that somehow include a loophole if someone is filming, adjust/amend those laws. Creating an entirely separate law which only covers filming seems, again, to be trying to prevent filming, not interference with the police.