The incident was one of only a few to occur across Race Week among an otherwise well-behaved crowd, according to Chifley local area commander Superintendent Michael Robinson.

This year’s race drew the second-highest attendance in the event’s long history, attracting 201,416 fans on the Mount across the four days.

Supt Robinson said Saturday night’s incident in the Mount’s shower facilities was being investigated by detectives.

He added that it was a mobile phone that was used for the filming.

The offender allegedly placed the phone under the door to capture the footage.

Otherwise, only a number of minor anti-social issues were dealt with by police during the race festival.

“Generally, the behaviour of crowds has been exceptional,” Supt Robinson said.

He added that the command received approval for local Chifley officers to work additional hours across the week, rather than requesting higher numbers of out-of-area officers.

He said this was due to previous public feedback and the local understanding and familiarity that Chifley officers have with the region.

V8 Supercars chief executive officer James Warburton said this year’s crowd attendance over the four days was up three per cent on last year’s crowd of 195,261.

“This is one of the biggest sporting events in Australia and one of the world’s iconic motor races and to crack the 200,000 mark is a great endorsement by our fans,” he said.

He said he also wanted to acknowledge “all our teams, drivers, officials and volunteers who make this event what it is”.

Mr Warburton said he was pleased with the growth in crowd numbers for the V8 Supercars.

“Our crowds continue to grow with over a million fans attending V8 Supercars events so far this year and millions more watching on television around the country and the rest of the world,” he said.