A video of a mysterious saucer-shaped flying object has created quite a stir online, with some enthusiasts calling the sighting a real UFO, while most people have simply called the video a hoax.

Here's why.

The shot of the so-called UFO was captured by an unnamed passenger from the window of an airplane above Seoul in Korea. If the video was real, surely the passenger would want some credit for the shot? 

The video in question was uploaded onto YouTube by user Crazy Breaking News.  It shows the white saucer-like object gliding through the sky below the plane.

I don't know, but it looks a little bit strange and not really similar to the other videos. If it's really real and not a fake, it looks like a kind of military drone for me. What do you think? the User wrote in the caption of the video in YouTube.

The passenger who filmed the shot zooms in during the video, which displays the air craft speeding up and rising in altitude before exiting the shot.

People who have watched the video have had mixed reactions. While some actually believe it might be real, most people have opted for a more cynical view.

Money: User Hospiced Weller accuses Crazy Breaking News of scamming people with UFO videos as a means to make money from advertising.

He opens his YouTube account two weeks ago and already he has 9 videos of UFOs filmed from planes that people have SENT him. Oh and the people were also nice enough to let him have the COPYRIGHTS so he could place ADs on the videos. I guess they'd rather him make the $20,000 he's made from this video than them huh? Yeah this is a CGI hoax. Get over it. He has a bunch of these videos. He managed to hit the LOTTERY with this one! CHA CHING! Weller writes in a comment.

Technical Glitch: User Psued0Name notices that when stabilized, it is easy to see what is going on with the video.

The edges of the UFO are not blurred like all of the other background objects, it seems like a separate effect from the background, and in fact you can see edge noise on the shape of the UFO indicating it's a fake, he says. It doesn't even look right if you start to look at it hard, especially slowed down frame by frame.

Zoom Trick: Another user agreed, saying it is obvious the video is a fake by the way the camera moves and zooms in.

It's the camera that's moving not the dot, creating the effect. Hold your finger still in front of you, now without moving your finger move your head left or right and notice the background movedbehind your finger while your finger remains still. Hence why this guy didn't aim camera up to follow this UFO as you pointed out, ridiculous, wrote user Norby 16.

What do you think? You can watch the video below.