What terms of service do you agree to when you purchase a ticket and attend the event? Do you agree not to take and post videos of the event?
The ticket ToS specifically forbids any posting of match content. In fact you cannot bring any dedicated "audio, visual, or audio-visual" equipment into the ground. You can bring your mobile phone with you but, if you use it to capture any of the action, nothing you capture "may be published or otherwise made available to any third parties including, without limitation, via social networking sites."
The copyright angle is pretty moot. By buying your ticket, you've signed up to these terms and conditions.