So I have ocd, and I definitely experience what you described in your original post. Especially the idea that people/animals/toys (as well as possible electronics/tiny cameras) can see me, or listen to my thoughts. My ocd is mostly not about these things (I also have a lot of compulsive behaviors), and I honestly can't say for sure whether these are obsessions or delusions, as I've wondered the same thing myself, but I think the fact that I know it's a silly thing to think, even though I can't shake it, it still makes it an obsession rather than a delusion.
To me a delusion would be something that you absolutely believed and could not be convinced of otherwise, such as that the floor was made of lava, or that you were the devil, or that your fingers could shoot lasers (these are all real examples that I have heard of from other people).
So to answer your question, and relate, I think these are obsessive thoughts that you are experiencing, since you seem to be aware that they are not logical, even if you can't shake the thought (I generally can't either).
Hope this helped!