hi....
i want to built a mechanism for camera to turn 360degree for this thing(below link) so can any body give suggestions??

https://www.hobbyking.com/hobbyking/store/catalog/26833.jpg
thank you!!!!!

Please read up on how to make a servo rotate full 360 degrees.  You will need two of those for total coverage, and appropriate mechanical structure.

Read the description on Youtube for these.