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Answer:
Do not confuse NIR (near-IR) with IR; your webcam will not see heat until it is nearly “red hot.” It takes a different type of sensor to detect true IR associated with more modest temperatures. Usually people call IR image sensors “thermal imagers,” and the company FLIR is so well known in that field that many people just call them FLIR cameras. However, you don’t necessarily need an IR camera to find heat leaks; there are lots of non-contact IR thermometers that you can use to sample temperatures from a modest distance — you’ve probably seen a version of them being used to check people’s temperature during the pandemic, but you’d want one designed for general use rather than measuring body temperature. IR thermometers are essentially single-pixel thermal imagers.
One more note: you’re usually not looking for heat escaping, but for cold getting in. After all, what you really care about is the temperature inside, not outside, and small places where cold air intrudes might not be visible from the outside. This is especially true measuring at a large distance, because most thermal imagers have very low resolution and a small leak might be a tiny fraction of the area sampled by one pixel.