"The offending behaviour is disgraceful," Judge Christopher Hoy said at Sydney's Downing Centre District Court.
The victim, a "shy and awkward" girl with an intellectual disability, was invited to the party after befriending Tristan Carlyle-Watson on Facebook.
She became so drunk she has no memory of what unfolded.
The graphic 17-minute video shows the men lining up to take turns sexually assaulting the girl who at times appears motionless.
Devereux, holding the camera, is heard urging them on.
"This offender spouted words of demeaning vulgarity and crudity," Judge Hoy said.
"His commentary suggests increasing and ongoing enthusiasm."
Devereux didn't touch or sexually assault the victim but he was present while others did and at no point did he intervene or assist the victim, Judge Hoy said.
He said the "revolting acts may never have seen the light of day" had police not uncovered the GoPro footage while investigating an unrelated matter six weeks later.
In her evidence, the 16-year-old told of being taken to the party where she was the only female and having a spiked beer "poured down my throat".
She told the court of waking up naked in a room and not knowing where her clothes were.
"I was sick, my belly was sore, I was bleeding everywhere," she said.
The girl, whose identity has been suppressed, didn't know she had been sexually assaulted until police contacted her.
In sentencing Devereux, Judge Hoy took into consideration his good record, relatively young age and genuine remorse.
"These charges I suspect have been the biggest shock of his life," he said.
"It is so sad that he now faces this predicament not only for him but for those who care for him."
Devereux will be eligible for parole in October 2020.
A jury in August found his co-offenders - Tristan Carlyle-Watson, Kurt Stevenson and Andrew Waters - guilty of aggravated sexual assault in company.
The trio is due to face a sentence hearing on October 27.
