开发者文档：http://127.0.0.1:6688/docs
如遇报错 “AttributeError: partially initialized module ‘cv2’ has no attribute ‘gapi_wip_gst_GStreamerPipeline’ (most likely due to a circular import)”
安装依赖 '''pip3 install opencv-python install "opencv-python-headless<4.3" -i https://pypi.tuna.tsinghua.edu.cn/simple/'''