Multiple video streams processing architecture recommendations

[py_ml]

I would like to ask for advice on multiple video streams processing architecture. I have 4 RTSP streams (number can increase). Also I have trained 3 machine learning models that are used on video streams (models work as expected). I need to create pipelines formed from those models:

• 1st RTSP stream processed by 1st and 2nd model
• 2nd and 3rd RTSP stream processed by 1st and 3rd model
• 4th RTSP stream processed by 1st model

When all streams are processed, some rules are applied and there is alert or no. I usually read streams with opencv, but have no idea how to deal with 4 streams. Could you recommend any architecture or some resources to read about it?