It would be helpful if you can provide more information about what you are trying to achieve.
If you are trying to find distance between two objects which are in same frame, you can extract the frame and save it. You can then find the distance between objects in extracted image.
Refer to this link for information on extracting frames and saving them:
Refer to this link for information on how to find distance between objects in a image:
Please refer to this link for more information:
