Even if it's not possible, which I think it is, it would be truly interesting either way. A large Primate supposedly running around the woods of the Pacific Northwest, which are absolutely enormous (To give you an idea of the PNW's ability to hide things, there have been many small aircraft that have disappeared over it and never been found.) and by chance, just happens to be the location of where the Gigantopithicus, a very real creature who existed a long time ago, would have went after walking across the ice bridge from Asia. Add in the huge amount of sightings by very credible People from all walks of like and over centuries, the footprints with dermal ridges that couldn't have been faked during the 70's and a video that many industry experts have claimed could never have been faked at that time and you have a genuine mystery on your hands.
I definitely think it's possible. But what bothers me is the lack of physical evidence and the fact that there would have to be a population large enough to breed.