Welcome to the forum.
Where, in that tutorial, are you having trouble, please?
You do it pretty much the same way in Premiere Pro as she did in FCP.
The Motion effect in Premiere Pro does not have "crop" but there is a crop effect you can drop on the clip and do it. Simple enough.
You might find it easier to use a garbage matte instead if the talent moves to close to the lights and you need to crop an irregular shape.