Training camp is less than a week away for the Cowboys after an offseason of change.This year's 25-day stay in Oxnard, Calif., will have a much different feel for Dallas with tight end Jason Witten and receiver Dez Bryant no longer around.The youth movement is in full effect with only three players left on the roster who are 30 or older.Over the next month, the Cowboys will whittle down their roster to the final 53 players and along the way show a few hints of what's to come in the regular season.Here is one of the major storylines to follow as the Cowboys kick off training camp.Who steps up at tight end?For the first time since the early 2000s, the Cowboys are in search of a starting tight end.Veteran Jason Witten retired this offseason, leaving a void on the field and in the locker room.The Cowboys' most experienced option is Geoff Swaim, the 2015 seventh-round pick out of Texas.