It's almost certain that many other planets have intelligent life on them, but the distances are so great between them, that it's probably going to be thousands of years before we have any visitors.
If we do get visitors in the near future, they will probably be way more advanced than us, and will therefore have no reason to hide from us.
And, if they don't want to reveal themselves, with their advanced technology, we will not be able to detect them. Certainly not with our eyes or cameras.
If any of these UFOs are aliens, they would most likely just be jokers, trying to mess with us. That seems very unlikely.
Ask any respected scientist, and he will say there is no good evidence of any intelligent beings visiting us yet.
In this movie, some people say things like "it suddenly dawned on me that I was seeing a UFO!" What an asinine statement. It's like they think "UFO" means an alien spacecraft. NO you IDIOT! It stands for UNIDENTIFIED flying object, but it's not even that. It's an UNIDENTIFIED IMAGE!!!!!! It's not necessarily an object. It's not necessarily flying. It could just be a light coming from somewhere else.
It could be a million things, and an alien spaceship is just about the most unlikely thing on the list.