How to implement an autonomous quadcopter?

Question

Automation

Hello.
There is a goal / idea to expand the possibilities of video surveillance near the house using a quadrocopter *.
What I would like:
1. When an alert is triggered (for example, movement on which of the cameras), the quadrocopter, which is in the "nest" on the roof, took off and flew to this camera and filmed what was happening there. And then returned to the nest to charge.
2. The quadcopter must fly around a predetermined route according to the schedule.
3. The ability to take control if you see something interesting on the transmitted video.
4. The ability to automatically pursue the selected target (moving object) within a certain radius
5. The ability to expand this zone with other "nests" so that as a result the quadcopter can expand its range
ps issues of legality are not considered in this issue, while only implementation is of interest
*-- a quadrocopter is understood as any aircraft that can fit these goals
. The question is the reality of what was conceived and the existence of solutions for this goal.

Answer 1

The idea is real, but it requires a lot of money and / or a serious level in programming and electronics.
https://developer.dji.com/onboard-sdk/