Cityscapes Segmentation

I have 2 questions:
1- I see there is (Cityscapes Segmentation) that only perform pixel segmentation. What if I want to get the detected model information like any other detection (bounding box, area, …)?
OR how to extract pixel info?

2- If it doesn’t give me the info that I want , how can I train Cityscapes to detect 21 models listed?
(PS: I am new to this so I elaboration is really appreciated)