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i am trying to make a project with Opencv python on real-time finding distance between other cars from my car.but i can detect cars and other things like 98% car 88% person i need your help how i can find distance ?

i am trying to make a project with Opencv python on real-time finding distance between other cars from my car.but i dash cam ,which can tell me how much other car is far from me.i already make a code in python opencv which can detect cars and other things objects like 98% car 88% person i ,i need your help how i can find distance ??some other sites they showed me to use calibration method as i am very new in this filed i dont know where and how i can use it . thank you