Here's how to remove backgrounds without a green screen in Premiere Pro.
Step 1:
Select your video clip and open Effect Controls panel.
Step 2:
Under Opacity, click the Pen Tool to create a mask around your subject.
Step 3:
Complete the mask by connecting back to your starting point.
Step 4:
For moving objects: click the stopwatch icon next to Mask Path, then press play to enable automatic tracking.
Step 5:
After tracking completes, fine-tune the effect using Feather and Mask Expansion settings to perfect edges.
Your background is now removed without needing a green screen.