The Activities block allows instructors and students to see all existing activities for a course by their type. This is advantageous if an instructor would like to look at multiple activities of the same type, such as multiple assignments, which cover several different weeks of the course. The Activities block is like a minuature of the Navigation, left side, under Activities/Resources. The Activities block will display on the right side of the page.
The Activities block will show Resources and inside of the Resources list will list out some of the Kaltura videos. This works much like the Kaltura Media Gallery, screen shot below.
Be aware that the Show all is similar, but not exactly the same as the Resources. The Show all will show Activities such as Quiz and Resources whereas the Resources in the Activities block will only show Resources, such as files, videos, and/or folders.