Being a woman I have absolutely no sympathy for the Muslim faith - However, I believe wilful stirring up of fear, racial hatred etc. is dangerous and can only end in a bloodbath.
What you saw in that video is a religious penance procession, most likely taking place in Egypt or other Middle-Eastern country with an introduction which made you think it was taking place in Europe and that the penitents were shouting slogans and threatening war to Infidels/Europeans. It was wilfully taken out of context and a malicious impudation was given in the intro by the easy-going bearded 'Aussie Barstard' who I will write to.
Do a Google search on 'Ashura' or 'Ashoura' - that's the name of the festival it is just before our Christmas in December, but is changeable, as the Muslims follow the moon calendar.
I am really sorry I am posting this under the present thread, which is unnecessarily alarmist - the British people and their culture are resilient and will win anyone over.