video shows john hargrove , who appeared in blackfish , using the n-word seven times as he talks to a friend on the phone .
hargrove said he ` had a lot to drink ' when the video was filmed and did not remember the incident .
seaworld released the video to reporters and said they received it last weekend from an ` internal whistle-blower '
hargrove says the company is launching a ` smear campaign ' against him .
he is currently on a book tour promoting beneath the surface .