Ringing at the door will trigger two events:
1 - A pop-up will appear on the registered computers and smartphones
2 - The stream of the ip-cam will be shown on a web-site for a certain time.
This can be used in parallel on any connected device. I.e. you can see the page on all computers. Nevertheless I have installed a cheap tablet in the entrance area as well.
Step 1: Video-Stream
Per default a wordclock is shown on the web-site.
When the arduino has been triggered, the video -stream of the ip-cam will be shown for a certain time.
A raspberry is used to host Web-Server as it is already running 24/7.
Nevertheless you could any other system like a NAS.
Step 2: Pushingbox
In parallel the Arduino is sending a trigger to pushingbox.
I choose pushbullet as a client on my computers and mobile devices.
After 1-3 seconds later you will get a pop-on on the registered devices.
Subsequently you can manually open the web-site.
Step 3: Arduino Code
The code is based on general code from http://www.pushingbox.com for Arduino.
I have basically cloned the function calling to call my own web-server .