Here is a link to the service manual for your laptop.
On p.20 it says that the Display assembly includes the following: display panel cable, web camera/microphone module and cable, and 2 wireless antenna cables and transceivers
On p.71 it shows the removal of cables from the systemboard. The #1 cable in the image shows that there are two connectors, one for the display cable and the other for the display function cable.
I think that the webcam cable and microphone cable etc are part of the display function cable which also goes through the hinge to the motherboard.
OK. Here is the link for your model HP Envy 17 (also known as HP ENVY 17-j111tx F7P64PA).
On p.64 Item #3 shows the webcam cable connection to the systemboard. The webcam/microphone cable also is shown on p.22 Item #6 and on p.66 Item #2.
Hopefully it is the right one this time.
ps Stupid thought but have you checked the webcam under Imaging Devices in Device Manager to see if it is enabled/disabled and that the drivers are OK?
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