Al Jazeera has obtained exclusive footage of a Colombian contract killer detailing an alleged $25m plot to kill Hugo Chavez, the Venezuelan president.br br He says the money was offered by Manuel Rosales, one of Chavez's main political rivals, during a secret meeting in 1999 br br A Colombian paramilitary group took up the offer, according to the hitman.br br Chavez has long said there is a plot by Colombia to kill him, and the relation between the two countries is tense.br br Al Jazeera's Gabriel Elizondo reports.