I've been rummaging on the Internet again.
Over on YouTube, I ran a search for 'infrared ghost' and came up with quite a few results. Now, there's no way to check back on what YouTube put up, so I can't vouch for the authenticity of any of the images there.
Many were films of orbs, and as everyone knows, orbs filmed with infrared digital cameras are bunk. Ignore them all.
A few other 'light anomalies', which are bits of hair or dust.
Some obvious fakes, some clearly done for a laugh rather than to attempt any kind of deception.
Some not-so-obvious fakes, and some suspect ones. One in particular appears to show a partial apparition but they were filming a tree sticking out of the pavement. Why would anyone do that?
And among all this, as I hoped, there were a couple that looked genuine. The child at the top of the stairs was one such. It's obviously from an investigation somewhere.
Yes, it's possible to fake it, but if this one is a fake, it's a really, really good one.