Video in torchvision

It is my absolute pleasure to say that video is now a first-class citizen in PyTorch!

No more re-encoding, no more convoluted FFMPEG scripts and custom dataset hacking - it's all here and it will only get better. A huge thanks to Francisco for getting this out there this fast, and for everyone that helped out with debugging.

Next up, we are planning to release a 3D channel-separated CUDA kernel, along with the state of the art ip- and ir-CSN models pre-trained Sports1M, Kinetics, and (hopefully) IG data. By ICCV, we hope to support most models from Video Model Zoo to have truly first-class support for video classification.

For more info, please check out the release notes and feel free to leave feedback on Github issues page.