ImageNet Large-Scale Visual Recognition Challenge 2015 (ILSVRC2015) introduced a task called object-detection-from-video(VID) with a new dataset.
So I go to the ILSVER2015 website and try to find the dataset. http://image-net.org/challenges/LSVRC/2015/index
But I can't find it . Could someone tell me where to get that dataset?
On the page you mentioned under Object detection from Video you will find Browse all annotated train/val snippets here.
I linked it here for your convinience.
Other than that you should be able to download everything following this link.