Your release. If a person is fraudulently induced to enter into an agreement, then the contract can also be voided, relieving the parties of their obligations. Fraud could be a lie or the concealment of the truth -- something misleading upon which you had a good reason to act. So, your right to terminate depends on the degree to which you were misled by the company. If you feel you were fraudulently induced to sign the release, a lawyer's assistance would be helpful. The company may find these contract arguments more persusasive if presented by an attorney.
Practically ... We usually don't prescribe a lawyer's advice but halting the use of video footage -- especially before it's released -- sometimes requires a strong advocate. It may be worth the cost of a few hours of legal time to avoid an uncomfortable association.