After more than 40 years, the game show “Wheel of Fortune” has a new host, someone with a long resume of popular TV and radio programs: Ryan Seacrest. He talks with correspondent Luke Burbank about his improbable life’s journey from Dunwoody, Ga., to Hollywood, and hosting a TV institution. Burbank also talks with “Wheel” regular Vanna White about finding the chemistry with her new hosting partner.