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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
If you have any control on the choice of the source/webcam, I'd recommend using a camera that can sense depth from the start (lidar cameras, like Intel RealSense if you are building something like a commercial robot; or a consumer device with lidar capabilities like iPad Pros since 2020, because they come with SDKs to do what you want from the start. E.g. https://developer.apple.com/augmented-reality/arkit/ or https://developers.google.com/ar/ or android devices). The problem is that without first-hand depth information, you need some way to guess that: you can train vision models to estimate coarse depth (e.g. https://openaccess.thecvf.com/content_CVPRW_2019/papers/Deep%20Vision%20Workshop/Ren_Deep_Robust_Single_Image_Depth_Estimation_Neural_Network_Using_Scene_CVPRW_2019_paper.pdf) but I am not sure if they are "exact" enough for your use case.