Install extras and hardware
Base install covers the OpenCV detectors. Install from GitHub (uv add git+https://github.com/freemocap/skellytracker) to get the code FreeMoCap uses; pip install skellytracker installs an older PyPI release. Detector libraries and ONNX Runtime backends come via extras: mediapipe; onnx; and mutually exclusive session backends onnx-cpu, onnx-cuda (CUDA 12 + cuDNN 9 pip wheels, no system toolkit needed), onnx-trt (TensorRT, engines compiled on first run), onnx-directml (any GPU on Windows). Bundles: recommended-cpu, recommended-cuda, and all-* equivalents. See the repo README and GPU_SETUP_GUIDE.md for details.