Navigate to Logitech Support web page, identify your webcam model and download the latest files available. After that, press Windows + R key combination, type devmgmt.msc and click OK. Expand the Imaging devices and Universal Serial Bus controllers lists, right-click on the webcam driver and select Update Driver Software. Use the Browse option to navigate to the installation package, select the downloaded driver and install it following the self explained steps.
Note: Also, you can try finding the webcam drivers using a driver identifier from Software Informer database.