In the Uk here are the rules for any type of filming in public.
CAN THE POLICE DEMAND TO SEE THE CONTENTS OF MY DEVICE AND DELETE ANY OF THE INFORMATION?
No they cannot. They would need a warrant under RIPA (Regulation of Investigatory Powers Act 2000) to access the contents of your device – and would have to arrest you and seize the device to obtain one.
If an officer asks to see what you have recorded tell them that they have no authority and if they wish to examine the device they should obtain the necessary warrant.
Any officer attempting to delete recordings or photographs from a device is committing a criminal offence, as this constitutes the destruction of evidence.
THE POLICE SAY IF I DON’T STOP FILMING THEY CAN SEIZE MY CAMERA FOR EVIDENTIAL PURPOSES, IS THIS TRUE?
Although in some instances the police can seize items that contain useful evidence there has to be a justifiable reason for doing so. A police officer cannot seize your camera under this power simply because you refuse to stop filming. Refusing to abide by an unlawful command that is made by a police officer is not a criminal offence. Therefore any attempt to seize your camera as a result would be malicious and the officer could be liable for a charge of misconduct.
WHAT IF THE POLICE PUT THEIR HANDS ON ME OR MY CAMERA TO MAKE ME STOP?
Any member of the police service or public that physically grabs at you or your camera in an attempt to stop you filming could be liable to a charge of assault. Anyone that threatens or intimidates you into putting away your camera could be liable to a charge of harassment.
If a police officer forces you to stop recording against your will, and you are not under arrest, then take a note of the officers collar number and make an official complaint of misconduct to their relevant Professional Standards Department.
Unfortunately, too many people in authority believe they have an automatic right of entitlement over the public. Paramedics, PCSOs, security guards and other state employees can become extremely aggressive and hostile when a member of the public records them. Although they are in the wrong for doing so it still pays to be discreet, reasonable and cautious when recording people who may suddenly become a physical risk to you at that moment.
AM I INFRINGING ANYONE’S RIGHTS BY RECORDING THEM?
The British Police are public servants and should expect to be placed under scrutiny. However police officers – and members of the public – commonly make outlandish claims of breached rights when they protest to being recorded.
Do these people object to the thousands of CCTV cameras that scrutinise us daily, without our permission or knowledge? No. And yet there is no difference between you filming out on the street and local authorities recording us all with CCTV; except for the fact you won’t have to apply to the authorities for a copy of a video you have recorded yourself.
If you hear an officer complaining that you are “infringing their human rights”, “acting suspicious” or “harassing them”, don’t let it intimidate you into switching off your camera. A police officer claiming he is being harassed whilst performing his duties is like a dustman complaining of a bad smell.
THE POLICE TELL ME IF I DON’T STOP FILMING THEY CAN ARREST ME FOR A PUBLIC ORDER OFFENCE, IS THIS TRUE?
The Public Order Act is the most abused piece of legislation in the UK when it comes to the police forcing people to comply with unlawful commands. And unfortunately too many officers think that ‘talking back’ is an arrestable offence, by way of breach of the peace or anti social behaviour laws.
Any police officer that uses threat of arrest as a means to intimidate, punish or force you to comply with them is acting unlawfully.
As long as you are not behaving in a manner that a reasonable person would deem as anti-social or a public nuisance then the police have no cause to arrest you for filming in a public place against their will.
Source
http://crimebodge.com/page/3/