you'd probably have to include the shoulders and chest and you'd have to spend a long time positioning the camera and fine-tuning the animations too accurately fit all situations which is very, very hard to do in video games, not to mention you'd have to find a way to move the eyes without moving the head always to not give the effect of being an owl with a sling attaching your arms to your ears. in the end it'll probably just be a nuisance to have your legs and shoulders blocking your view.