Victoria Lindsay was attacked on March 30 by six teenage girls when she arrived at a friend's home, authorities said.
One of the girls struck the 16-year-old victim on the head several times and then slammed her head into a wall, knocking her unconscious, according to an arrest report.
Later, according to a clip of the video that was released by the Polk County sheriff's office, the teens can be seen blocking a door and hitting Victoria.
"It's absolutely an animalistic attack," Sheriff Grady Judd said Tuesday on NBC's "Today." "They lured her into the home for express purpose of filming the attack and posting it on the Internet."
Victoria's father, Patrick Lindsay, said the teens intended to post the video on the video-sharing Web site YouTube.
Christina Garcia, mother of one of the defendants, said her daughter had turned the tape over to police.
The sheriff's office said that after the attack, three of the teens forced the victim into a vehicle and drove her to another location, where she was told she would be given a worse beating if she contacted police.
All eight suspects were arrested April 2 and charged with battery and false imprisonment. The three teens who took Lindsay to the second location are also charged with felony kidnapping.
Lindsay was treated for a concussion, damage to her left eye and left ear, and numerous bruises, police said.