10-12s Background Swap Video

I have a short personal clip—only about 10-12 seconds long—and I need the background swapped out cleanly. I’ll supply both the original footage and the video loop that will serve as the new backdrop, so there’s no asset creation required; it’s strictly a compositing task.

What I expect from you:
• Key or mask the subject accurately, keeping hair and edges crisp and free of spill.
• Composite the supplied loop seamlessly behind the subject, matching colour and lighting so it feels natural.
• Deliver one high-quality export in the same resolution, frame rate and codec as the source, along with the project file (Premiere Pro or After Effects preferred) for future tweaks.

This is a straightforward, single-shot job; if you’re comfortable with chroma keying or rotoscoping and quick turnarounds, it should be simple. Let me know your preferred software and estimated delivery time when you respond.