Gibson visited the prison in April 2008.
Herrera gave no details Sunday on the film. Gibson's publicist, Alan Nierob, could not be reached for comment.
Gibson filmed his 2006 Mayan-language movie "Apocalypto" in Veracruz. The actor-director donated $1 million to replace storm-damaged homes in Veracruz and in neighboring Chiapas state earlier this year.