Add object detection example for pytorch branch

[frank-onspecta]

Please add one or two object detection examples to pytorch branch, similar to aio-examples of tensorflow-aio (main branch). The example should perform one run with AIO, one run without AIO. Then compare the result with visualization of bounding box and classification. Also compare the performance.

[frank-onspecta]

Thanks Karol, Could we also add Jupyter Notebook example to object detection. You can reference the Jupyter notebook object detection example in TF branch of aio-examples