A vid comes to you, even at you. It's visual, it's auditory, and can, of course, pull you in. Its purpose is to do just that, draw you into the world you see and hear. But a book? You go into it. There's no visual or auditory other than what forms in your own mind. You visualize the characters, the scene, through the words. You, as reader, interpret the tone of voice, the colors, the movement as you physically turn the pages.