Question: 1. Would it be possible for non-human apes such as chimpanzees,
gorillas , and orangutans to take the place of humans?
2. Like in the 1968 movie “Planet of the apes”, would it be possible
for apes to discover fire, agriculture and create complex
civilization?
3. Would they be able to communicate like we do? In a few thousand
years would it be possible for these apes to be able to travel
through space?
4. Also, in this world could humans take the place of modern day apes?
Climbing in trees and those sorts of things.

Are any of these things possible? Please let me know

Answer: 
Yes, all of that is possible, given a mutation affecting the brain (in Planet of the Apes the mutation was induced by genetic engineering into an ape).

The body forms do not make a difference, all that matters is a brain that can solve problems like people do. None of the common things people tell you are necessary are *actually* necessary: They don't need opposable thumbs, they don't need to walk upright, they don't need particular biological features of humans.

Chimps and gorillas already make tools and have been known to use weapons like rocks and sticks.

The only unique thing about humans is our mental life, the ability to plan more than a few hours in advance, to model physics and behavior, to think abstractly and recursively. Only the human brain, to our knowledge, can make a plan that will take years and thousands of people and will actually work (e.g. to make a pyramid, divert a river, build a city).

The evidence we have thus far is scant, but this ability appears to have been due to a singular mutation that occurred perhaps 200,000 years ago, by chance. It would spread like wildfire, especially once passed along to a male: As the only smart ape in the world they would be able to mate more or less at will and defeat all rivals with very simple plans. 

The odds of a mutation like that occurring again, but in a modern ape, are slim but not impossible. However, genetically engineering an ape to have a human brain is entirely plausible, putting motivations for doing so aside.

4) Humans can live naked in the wild and in trees without a problem and easily. Some do already. To remain there instead of building villages, shelters, traps, boats, etc, you would have to make them brain damaged in some way. Otherwise their human intellect will work every day to make their life take less work, be less dangerous, to invent weapons, to store calories in some way to be less dependent on the vagaries of nature, etc.
As question is posted answer is "NO".

Apes, as we have them in real Earth, cannot "take the place of humans".

In spite of having a genome 98+% equal to humans chimpanzee still lack that 2% enabling them to fill the gap.

The "gap" being ability to devise and use effectively a complex language capable to describe objects not previously known to listener (many animals are able to associate sounds to *known* objects/actions/situations, but that is not enough to trigger "civilization").

Of course, given a few hundred thousand years (a very short time, as evolution goes), some of the higher primates could evolve into *something* "human-like", but:

* Such an evolved ape wouldn't be an ape anymore, just like we aren't.
* Such an evolution is bound to touch other aspects of the "new ape", not only its brain.
* It is absolutely unlikely several different species would evolve "in parallel", just like it happened in the past: one branch evolved while the others took different directions.
* Having a world where all different species of apes "become intelligent" without any other physical changes is absolutely unrealistic.