Dwayne Johnson on tackling a dramatic role in "The Smashing Machine"

Action movie star Dwayne "The Rock" Johnson says he tapped into some childhood trauma to play mixed martial arts & UFC fighter Mark Kerrin in the new film "The Smashing Machine." He reveals to Tracy Smith that he told costar Emily Blunt and director Benny Safdie he was scared to take on the role, and talks about where he finds peace nowadays: his own fishing hole.