Kevin Costner on bringing "Horizon" to life and what's next after "Yellowstone" departure

Kevin Costner returned to the director's chair with his most ambitious project yet. The Oscar-winning actor-director writes, directs, produces and stars in "Horizon: An American Saga," a four-part movie series about the American West. Costner talks to "CBS Mornings" co-host Gayle King about the years-long effort to make "Horizon" and his future plans after leaving "Yellowstone."