Computer Vision Developer - Object Detection & Tracking on Video (Python)

I'm building a small sports analytics tool and need help with the video processing part. What I need: - Detect a ball and players on recorded match footage; - Track them across frames and keep consistent IDs; - Output detections as JSON (coordinates, frame number, object ID). The footage is fixed-camera, 1080p. I already have sample videos to work with. Models can be off-the-shelf - YOLO, ByteTrack, whatever you're comfortable with. No need to train from scratch at this stage. Looking for someone who can start with a small piece first so we can see how we work together, then continue if it goes well. Long-term collaboration possible if the first part goes smoothly. Please tell me in your reply: - What you'd use for detection and tracking, and why? - A project where you did something similar (link if possible)? - How many hours per week you're available?