Make this among your first projects for the evening because the pork loin bakes for nearly two hours. You can also stuff it a day ahead, refrigerate, and then pop it into the oven just before your guests arrive.
Combine first 7 ingredients in a small bowl. Combine apricots and capers; set aside. Trim fat from pork. Cut a 1-1/2-inch-wide horizontal slit into the end of pork; cut through to the other end of pork to form a deep pocket using a long, thin knife. Spoon apricot mixture into pocket; pack using the handle of a wooden spoon. Rub surface of pork with cumin mixture. Place pork on a broiler pan coated with cooking spray. Insert meat thermometer into thickest portion of pork. Bake at 350 degrees for 1 hour and 55 minutes or until thermometer registers 160 degrees (slightly pink).