The case began when a woman called to report her daughter had been raped by Frazier and his 17-year-old son.
Investigators say Frazier - trying to defend his son against the rape accusation - showed the tape to school administrators to try and prove the sex was consensual.
Police got a search warrant and recovered the whole tape. They say it shows a lot more than the teen having sex with the girl. It allegedly shows Frazier forcing the girl to have sex with him too.
No charges have been filed against the 17-year-old son.
Frazier's attorney says his client is denying the accusations against him.
"He is denying any allegation of any forced physical contact," said attorney Patrick Roberts.
If convicted, Frazier faces a maximum sentence of more than 40 years in jail.