/lib/udev/rules.d/80-uvcdynctrl.rules is in uvcdynctrl 0.2.4-1.1ubuntu2.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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# Rules for adding dynamic UVC extension unit controls to UVC devices.
#
# Note that the DRIVERS clause only works in newer versions of udev. For older versions the clause
# never matches, making the script a no-op.
# udev versions confirmed to work: 141 (Ubuntu 9.04), 142 (Ubuntu 9.10)
# udev versions confirmed not to work: 117 (Ubuntu 8.04)
###################################################################################################
ACTION=="add", SUBSYSTEM=="video4linux", DRIVERS=="uvcvideo", RUN+="/lib/udev/uvcdynctrl"
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