piTV gives your raspberry pi functionallities similar to that of a chromecast. It sure lacks some of the chromecasts functionalites but it gives the option to setup a pin to control it
This app enables you to send video links from most apps as well as offer simple media controlling options
This software isnt perfect and is not built for security what so ever all text and pin is transferred and stored in plain text.
A server side software must be installed on your raspberry pi for this app to function.
It can be found at: https://github.com/shandoosheri/piTV