You're allowed to jump a red light or force a Stop sign if you are impeding the progress of the Emergency Services. I've done it loads of times all over the country. Make a not of the time, date, location and registration number so if you get a ticket you can write to the NHS Trust, Fire Service, Police, Mountain Rescue, Coastguard or Dominoes Pizza so they can either get the ticket quashed or write a letter to read out in court so the Magistrates can throw the case out instead.
Okay this isn't a dash camera but I hope bar mounted ones count.
https://www.youtube.com/watch?v=tBi9m4nNPYQ&feature=youtu.be