From an article about the camp this year:
"The list includes reigning Heisman Trophy winner and Manning Award winner Johnny Manziel of Texas A&M.
"He is a great kid who has had to endure an enormous amount of attention and scrutiny," Manning said. "He is an outstanding player and we are happy to have him back."
Others attending include Allstate Sugar Bowl Most Valuable Player Teddy Bridgewater of Louisville, A.J. McCarron of national champion Alabama, Zach Mettenberger of LSU, Nick Montana of Tulane, Tajh Boyd of Clemson, Jeff Driskel of Florida, James Franklin of Missouri, Tanner Price of West Forest, Marcus Mariota of Oregon, Aaron Murray of Georgia, Tyler Russell of Mississippi State, Connor Shaw of South Carolina, Justin Worley of Tennessee, Scotty Young of Louisiana Tech, Bo Wallace of Ole Miss, D.J. Williams of Grambling, son of Doug Williams, and Kolton Browning of ULM."
Not sure who actually participated.