This shouldn’t be too hard to do. You’ll probably get close to perfect quite quickly.
Create a Null Object.
Select your video layer.
Go to Animation>Track Motion
Get it tracking!
Then, before you click apply, click ‘Edit Target’ and choose your Null to be it.
Then apply your tracking.
Then all you have to do is parent your halo to the null.
You could cut out the null and just apply the tracking to your halo layer, but I prefer to do it with the null in case I want to do some other transformations. Read your manual or the help files for more assistance with layer tracking.
– The Great Szalam
(The ‘Great’ stands for ‘Not So Great)
No trees were harmed in the creation of this message, but several thousand electrons were mildly inconvenienced.