I have a pretty good hunch what these kids caught on video.
The latest "blobsquatch" video to go rocketing around the internets is this little gem from Utah. The ostensible backstory is that a couple of backpackers saw a big shape, started filming it, and when it appeared to stand up in a human-like fashion, they screamed and ran. The footage is - unsurprisingly - blurry, grainy, and entirely unclear.