To access the videos:

The videos are grouped by categories. These categories are listed in the right menu. By clicking on a category, you go to the page with videos uploaded. Each video is classified in one category even if the video includes footage that can be associated with several categories.

After clicking on a category in the menu, a page appears with at the top the list of relevant videos and in the middle one of the videos ready to be viewed. Either you click on this video to view it, or you select another video of the same category by clicking on one of the images that appears at the top of the page.
You can adjust the sound level, and display the video in full screen.
A sample copy screen for a category: