Mounted video cameras on dogs!

i watched a show on tv a while back where they mounted a small camera on a dog. they turned it out on some tracks and the dog found a hog and bayed it. they then put a tracking collar on the hog and came back i believe a few days later to see where the hog had traveled to. the video was stored in the camera and they viewed it after. it was cool to see the dog working the hog and then to see the hog running from the dog. it was a little hard to watch because the video bounced around alot. i've said a few times when i new for sure the dogs were running or even had a hog bayed and something would happen and the dogs would come back i wish i had a camera on the dog. i thought about trying a camera like the one's used on helmets and mounting it on a harness.