Interested in the recognition of gestures? This presentation might interest you. It talks about the recognition of dynamic hand gestures using a Leap Motion sensor and feeding the images created by a viewer in a convolutional neural network (CNN). This is the link:

3D dynamic hand gestures recognition using the Leap Motion sensor and Convolutional Neural Networks

The code is available here.

And… work in progress… training a 3D ResNet-50 to classify image sequences.