While it is generally not wise to make public videos documenting an infraction to Title 14 of the CFRs, the FAA has apparently wisened up to YouTube evidence, as can be found in this Noticed published in April.
A friend of mine said it most eloquently:
"Although I am in no way implying any of you would do anything contrary to regulations whether or not captured on video, there has been a rumor that flying within 5 miles of an airport while fiddling with a GoPro in the cockpit is failing to maintain a 'sterile cockpit' in the airport environment. The video could constitute evident for a violation and you might get a letter. I'd hate to think we've come to this."
Link to PDF version of the published notice.
https://www.faa.gov/documentLibrary/media/Notice/N_8900.292.pdf
"Y'all be careful out there"
A friend of mine said it most eloquently:
"Although I am in no way implying any of you would do anything contrary to regulations whether or not captured on video, there has been a rumor that flying within 5 miles of an airport while fiddling with a GoPro in the cockpit is failing to maintain a 'sterile cockpit' in the airport environment. The video could constitute evident for a violation and you might get a letter. I'd hate to think we've come to this."
Link to PDF version of the published notice.
https://www.faa.gov/documentLibrary/media/Notice/N_8900.292.pdf
"Y'all be careful out there"