For those who are interested in knowing what to expect on Tuesday afternoon, 12 March 2013 when the Conclave officially begins, with the Cardinal-electors marching into the Sistine Chapel, here is a video recording from the 2005 Papal Conclave. Not a very good quality, so I hope they do make a better recording for 2013 Papal conclave.
You can clearly see the Dean of the College of Cardinals at the time in the video, Cardinal Joseph Ratzinger, who was elected Pope in that Conclave, and whom we knew better as our beloved Pope Benedict XVI, now Pope Emeritus.