Hello, @felipe! Welcome to the forum!
Did you install DroidCam in regular mode or DKMS mode?
If you installed it in regular mode it needs to be reinstalled after every kernel update due to the need to rebuild the included Video4Linux2 kernel driver.
In DKMS mode the driver gets automatically rebuilt after every kernel update so there’s no need to reinstall it with every update.
You can reinstall DroidCam in DKMS mode by running the following commands:
sudo /opt/droidcam-uninstall
cd /tmp/
wget https://files.dev47apps.net/linux/droidcam_latest.zip
unzip droidcam_latest.zip -d droidcam && cd droidcam
sudo ./install-dkms
You can also run the following optional command afterwards to add sound support:
sudo ./install-sound
Full DroidCam Linux documentation can be found here: https://www.dev47apps.com/droidcam/linux/
https://github.com/aramg/droidcam/tree/master/linux