As Vipitis says, if it isn't sold for thermography (=measurements) then it's highly unlikely to be usable for that purpose.
You are very likely to be able to see heat leaks, damp patches or whatever with that sort of 'scope but it's not the sort of thing you could put into, fro example, a homebuyers' report. Ditto any other application where any kind of temperature measurement is required.
Generally speaking it looks like the image quality from that scope is pretty good, though I was puzzled why the sample video never went below 2.5x magnification. (Maybe that's the basic optical system characteristic and has nothing to do with electronic zoom). It was also instructive to see how much processing was going on to achieve usable quality at the highest levels of magnification. Assuming the x2.5 factor is indeed down to the optics then 'x50' is a x20 digital zoom, meaning the effective sensor resolution is just 32x24 pixels!