Jennifer Hudson’s big, unmistakable voice has carried her from the pews of a church in Chicago to stardom on “American Idol,” then to an Oscar and a pair of Grammy Awards. In this week’s “Sunday Sitdown,” Willie Geist talks to the singer and actress about that journey from reality show to Academy Award, her role in the highly-anticipated new “Cats” movie, and how she moved forward after unthinkable tragedy in her life.