No need for cover with this fox, she's pretty used to people wandering so long as you don't go to close. I see her and her mate snuffling around most nights. They have two cubs in tow just now so she was probably seeking some peace and quiet away from the children for a while.
When I go home that evening she was sitting on the grass resting. She's used to me being around so long as I stay down my end of the grass, stay low and quiet.
I went into the house and grabbed the camera and just set up laying on the ground. I focused using the view finder and then swapped to live view. The swivel LCD is very handy for this since I can have it lay parallel to the ground. To the fox I appear to be looking down at the ground behind the camera and not through the camera toward it. It's less threatening and also a lot more comfortable for viewing.
Equipment was a D5000, 70-200mm set to F6.3 for best focus performance, enough DoF to cover the head but still throw the background into OoF. Camera was mounted via a Kirk replacement foot onto a Markins M20 ballhead mounted in turn on a Kirk LowPod.
Reframing as the fox moved would be too jerky if I used the ballhead controls. Hence I just leaned on the back of the LowPod to make the lens go up or down and shifted the back end of the pod to make it turn to the side. Movement was much smoother using that method.
No, autofocus doesn't work in movie mode. If you look when the fox move off to camera right you will note it's slightly out of focus. I spliced out the following frames while it was hiding behind the bush on the right. The final frames were re-focused by hand while continuing to shoot. The highlights on the bush leaves allowed me a guess how much to adjust focus. If you look at the bush right at the back you'll note it moves into focus as I manually pull focus to track the fox as it walks out to camera left. I was surprised how well I could gauge the focus even though I only had a tiny area of the screen to use and the screen would not allow zooming during capture. So while AF doesn't work, MF can still be used and to some effect with a bit of care and practice.
One point to note - don't make my mistake and remember to switch off VR. Good grief that things clatters. You won't hear it in the movie since I removed the sound track and replaced it with an audio track made a few minutes later at the same location using an iPhone as a recorder.