I still don't know anything about your shot. Is it a hand held shot in a park? If you have cut out the lion and the perspective matches the perspective of your background shot then run your track, make sure that it is a good track, then add a null to the composition and set the null as the target of the track. Make sure the null stays put in the scene in relation to the ground. Then position your lion shot, scale and rotate, and set the null as the parent of the lion. Except for color correction and fixing the edges you should be done.
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