Target acquired: Automatically find targets in drone/quadcopter video streams (pyimagesearch.com)

Actually, finding human faces is a little bit easier (or at least comparable) to finding logos in images. The human face has a standard shape, whereas logos can be quite different shapes, sizes, and styles. The standard approaches to human face detection include Haar cascades, HOG + Linear SVM, and now we're even using deep learning. These techniques could also be applied to the drone video as well.

I think that technology has been on sale since the 18th century at a gun shop near you.