Before the tragedy occurred, the camera can be seen panning towards Perez who explained to the couple's YouTube subscribers what she and Pedro were about to do.
Perez, 20, has pleaded guilty to manslaughter in the second degree in exchange for a 180-day jail sentence. She is also banned from owning guns for life and is prohibited from profiting from the case.
'Me and Pedro are probably going to shoot one of the most unsafe videos ever, ' Perez wrote on Twitter prior to performing the stunt.
Norman County Attorney James Brue said the "foolish stunt was dreamed up, planned, and executed by Pedro Ruiz, and the defendant wrongfully and tragically relied on his assurances that the stunt was safe", according to the Star Tribune.
According to local media, 30 people - including the couple's young daughter - witnessed the shooting. She was spirited away by her family after the hearing before reporters could ask questions.
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Her YouTube channel remains active almost nine months after the shooting.
She added: "All the insane stuff will [be] on his channel and mine. will be our family life!"
Perez has retained custody of her two children with Ruiz, and her sentence includes a couple different elements.
Perez and Ruiz's channel featured many videos of them pranking each other, doing viral YouTube challenges and life as being teenager/young parents. In one such video taken at a fair, Ruiz talks excitedly about someday reaching 300,000 followers.
The video was submitted to law enforcement officials as evidence. "I love my cousin and miss him very much", she said through tears.
Gudmundson told the judge that his client didn't feel she could make a statement.
In what might seem a weird approach to a United Kingdom audience, the judge told Perez she could serve her time in 10-day increments over the next three years. Had she been convicted at trial, she would have faced up to 10 years in prison.