privacy: the easiest way to blur out some location specific objects in a video
You are going to need to use; preferably After Effects to do this. You could also do it in Premiere; but AE is the way to go, because you can use the tracking feature to auto follow objects; combined with a custom mask (with a blur filter applied). 

Other than that your options will be limited. 

I believe Adobe CC allows a 30 day free trial; and it's monthly in terms of cost, you could always try it and see if it suits your needs, and go from there).