This is one of them UFO videos that catches your eye straight away? If you look at the video you'll see that it hovers and then it "probably knows" it's been filmed or can sense the electrical signal pointing it's way and so goes straight in to a dive?
It's all speculation but that's all we have to go on "any UFO video"? Because all UFO sightings in one way or another are just "unexplained" and cannot be worked out? Even if you do get a very likely story, there's still the unknown factor. By their very definition, UFOs are unidentified and as such what comes with that is a huge question mark above it.
Still's from the actual video (below) have highlighted the shape, color and it's orientation. The above image gives us a close up of the Flying Saucer (UFO) and it's probably metallic in nature.
Then suddenly towards the end of the video that is when the Flying Saucer suddenly starts a dive maneuver and it's scares the eye witness to the extent that the camera is shaking.
The Instagram account called ufo1907 has reported on some very good UFO incidents and has an extensive library of reported and unreported UFO encounters? I recommend that you check out this Instagram channel as you'll definitely see something there that will amaze you.
Here's the video of an Unidentified Flying Object or Flying Saucer (whichever you prefer) sighted in Costa Rica. That's all the information with this video.
Source UFO1907 Instagram.