Yes, it’s illegal you bloody creep. If you are going to video anyone for anything, then you need a consent form signed by the person in the video. If you are just filming your mate doing something silly for Youtube, then you should really get a consent form for that too.
If that video blows up and goes viral then your mate will be well within their rights to sue you.
Videoing someone without consent is illegal in;
- New South Wales
- Australian Capital Territory
- South Australia
- Western Australia
- Northern Territory