Video classification example

[avijit9]

Hi,

As we all know that video representation learning is a hot topic in computer vision community (thanks to recent advances in self-supervised learning), is it time to add a toy example for video classification? This code would be as simple as image classification examples. For example, we can add an example of video classification using I3D on UCF-101/HMDB-51?

[msaroufim]

I'd encourage you to contribute this example, would be happy to review