[Idea] Object detection and location of the object

[VanDavv]

Prepare an example with object detection, that will pull the closest depth point from the object and return it as the object distance.

Related to discussion on discuss - https://discuss.luxonis.com/d/67-distance-to-closest-point-on-an-object-bw1098obc

This demo could use the ROI crop capability of Gen2 to pull out only the depth map for detected objects, and then pass this (much smaller set of) data back to the host where a variety of selection mechanisms can be used:

1. Front of the object
2. Average of the object (but not the background)
3. A given edge of the object
4. Some subset of the middle of the object.
5. The front say 20% of the object.