small white tracking box i cant get rid of new to blender and accidentally clicked SOMETHING, now i have this annoying box that's "tracking" and i cant get rid of it. ive searched through youtube and other sources for about an hour but since i dont know what feature it is i can find no useful info.  (also, may be unrelated but now grease pencil stopped working as well)
This is a tracking point used for motion tracking. 

It is creating by pressing Ctrl + the opposite for your select button. 
To get rid of it, simply select it and press X, delete.