Dear Sir, thanks for your question. My name's XXXXX XXXXX I'm going to assist you with it today.
From the facts in your enquiry, you do not appear to have used any threatening or abusive behaviour or language that could be deemed a criminal offence or that could justify a civil action. You are entitled to photograph your car on a public thoroughfare and it would be adviseable to do so, if this relates to your grounds for challenging the penalty charge notice (PCN).
Further you are perfectly entitled to advise the warden that you intend to challenge the PCN, (although it is, of course, technically unecessary to give him notice).
Traffic wardens (or as they are now called, Civil Enforcement Officers), often wear these cameras on their uniforms and turn them on to avoid (as much as record) confrontation. They do not use the footage in relation to the PCN and, unless a crime is committed, the footage is redundant.
I hope that is useful but please don't hesitate to come back to me if you require any further clarification. If I've been helpful, I would also be very grateful if you could take time to rate my answer by selecting either, OK, Good or Excellent.