For Thinkpads the documentation you're looking for is the "Hardware Maintenance Manual" (HMM). E.g. here is one for the X260, it clearly describes where the camera/microphone assembly is, how to get to it and where its wire connections go: https://ok2.de/ThinkPad/HMM/x260_hmm_en_sp40j72016.pdf I haven't taken apart one of the more Ultrabook-style ones, so not sure how accessible those are, but the traditional ones are very serviceable.

I wouldn't be surprised if the better Dell models have similar documentation available.