When iconic trumpeter Wynton Marsalis performs to a sold-out house at the Kennedy Center Sunday, he will no doubt be pleased with a large group of teens who have come to watch and further learn from the master. In many ways, these are his kids and they are known as the Capitol Jazz Project, who invite the public to watch them play Sunday on the Kennedy’s Millennium Stage as part of “The Presidency of John F. Kennedy: A 50th Anniversary Celebration.”