Many 8mm cameras will allow the focused image to extend all the way to the left edge of the film, without masking the portion of the film containing the sprocket holes. Although it is common for projectors to mask off this area because the holes would show up as a brighter white than anything else in the picture, some video transfers will services will capture a portion of the images that extends somewhat into the sprocket holes. This is done because, among other things, television sets are prone to crop the edges of the film slightly, so if the edge of sprocket holes corresponded to the edge of the video image, a television set would crop off some of the image that was inside the sprocket holes. Further, for some kinds of documentary purposes it may be desirable to show a somewhat wider frame than would normally have been projected.
While Super 8 cameras may also expose onto the sprocket holes, the sprocket holes in Super 8 film aren't nearly as wide as in the earlier 8mm format.
Incidentally, there is a slight downside to having cameras expose all the way out to the edge: a lot of movie film is manufactured with the edge pre-exposed to contain markings indicating the year of manufacture. Having a bright image pre-exposed all the way out to the edge can make such markings hard to read, at the same time as the markings will undermine the usefulness of having the image extend that far.