It is much easier if you have a cameraman.

I have a few kills on tape that I had a friend film or I filmed a friend shoot.

I tried to video an archery kill myself one time with a homemade device clamped to my treestand. ( this was many years ago before the had a Gorrilla Arm and with a big VHS camera)

Anyway, I had the camera aimed on the trail I was watching. I got the deer walking into the shooting lane and standing there. Just before I released the deer got spooked and trotted a few yards to the right. I shot anyway. At leastI got the deer a few seconds before the shot and you could hear the arrow's impact.