8-Second Video Background Removal

I have a short, 8-second mixed-media clip that needs the background completely removed so only the main subject remains over a transparent backdrop. The finished file should be delivered as an MP4 with the same resolution, frame rate, and audio as the original.

Please work frame-by-frame if necessary to ensure there are no visible edges, color spill, or chatter; the result must look clean against any future background I choose to place behind it.

When you send the final version, include:
• The transparent MP4 (matching original specs)
• A quick preview file so I can confirm the alpha is perfect before we wrap up

Let me know if you need the source clip or any additional details to get started.