Z. Rex, The Hunting: Book One by Steve Cole

You're 13 and find yourself on your own. Your father, who has developed the world's cutting edge research on virtual electronic game-playing, has been missing for weeks. And suddenly you're being hunted by men with guns, your picture is on the news, and worst of all, something seemingly impossible is chasing you - a savage, man-eating dinosaur. How can that be? Why is everyong trying to capture you? And what is your strange connection with this 21st-century prehistoric monster?
(From the YouTube description)