PAS leader Khalid Samad says the clip shows how the 15 MPs were offered RM2 million each to jump ship.
The three-hour video was recorded at a restaurant in the Klang Valley in 2010 but the Shah Alam MP only revealed four minutes of the clip to reporters.
The clip showed how the alleged agents offered RM2 million for each MP to jump ship.
Khalid said the names of the 15 Pakatan MPs would be revealed next Tuesday.
The video recording also showed the two agents, who were allegedly members of a NGO, negotiating with two representatives of a PKR MP.
“Zahrain’s name was mentioned because he quit the party,” said Khalid, referring to Bayan Baru MP Zahrain Mohd Hashim who resigned from PKR in 2010.
“We planted a video [in the restaurant] without the agents’ knowledge.
“There are five individuals in the recording – the two agents, their driver, a man and a woman who were the representatives of the PKR MP,” he added.
The alleged agents, said Khalid, told the representatives that they had identified 15 MPs and also asked them to scout for more who could be “bought”.
Asked if he was one of the 15, the PAS leader smiled and shook his head.
The 2008 general election saw Pakatan making significant inroads by capturing several states and denying Barisan Nasional a two-thirds majority in Parliament.
Following this, there were numerous allegations of opposition MPs quitting their respective parties after being lured with cash rewards, a charge which BN denied.
The exit of three Pakatan state assemblymen also paved the way for BN to re-take Perak, one of the five states which fell under opposition control in 2008.
In another development, Khalid also criticised the move to freeze PTPTN loans for the new batch of Universiti Selangor (Unisel) students.
He accused Umno of willing to sacrifice the interest of the Malays for political purposes.