This is actually an advanced and super complicated coding. You need to understand and familiarize with “Spot Directing” (and maybe “Zoom Directing” if you want to make it look more realistic). Here are some links that might help you with that.
Guide for Spot Directing Here
Guide for Zoom Directing here
Have fun directing!
PS: I really hope this will help you 
Sorry if this is not what you needed in the first place!