If you own a webcam from this list than you can attach it to the AsusWRT routers usb port and see in real time images from it, like babyroom, garage, courtyard...
This version is for arm devices like RT-AC56U, RT-AC68U, RT-AC87U...
1- Install Debian from here
2- Download videomod script
chmod a+rx /opt/etc/videomod.sh
2b - Download and load UVC Modules (if you have a different firmware version, use this guide to compile modules or ask someone on forums)
cd /
tar -zxvf /opt/tmp/uvc_modules_2.6.36brcmarm-380.58-arm.tgz
/opt/etc/videomod.sh load
3 - Enter Debian
4 - Update Debian
apt-get upgrade
5 - Install necessary packages
6 - Download and install mjpg-streamer
dpkg -i /var/tmp/mjpg-streamer_182-1_armel.deb
7 - Download startup script
chmod 755 /etc/init.d/S99mjpg-streamer-debian
8 - Exit Debian
9 - Add script to chrooted services list
echo "S99mjpg-streamer-debian" >>/opt/etc/chroot-services.list
chmod 755 /opt/etc/chroot-services.list
10 - Create script to load UVC Modules and mjpg-streamer at startup
Add this lines
#!/bin/sh
/opt/etc/videomod.sh load
sleep 5
/opt/etc/init.d/S99debian start
Save with CTRL-O / Enter / and exit with CTRL-X
11 - Start mjpg-streamer
12 - Go to 192.168.1.1:3000/stream_simple.html and should see images from your webcam
If you want to change username, password, port, resolution and fps, edit /opt/debian/etc/init.d/S99mjpg-streamer-debian script
Tested successfully with Logitech C270 webcam