Please, could you tell me if it is possible to automate Terminal Emulators using Selenium, I need it to be in Selenium not in UFT
NO because selenium is a browser based tool. Browser manufacturers implement the protocol for their browsers and it works based on HTML pages. The DOM methods wouldn't work against non-HTML windows such as a terminal.
You may wish to consider using http://sikulix.com/
SikuliX automates anything you see on the screen of your desktop computer running Windows, Mac or some Linux/Unix. It uses image recognition powered by OpenCV to identify and control GUI components. This is handy in cases when there is no easy access to a GUI's internals or the source code of the application or web page you want to act on.
Terminal windows might work quite well with this - if you set them up correctly. possibly super small like 4 or 5 lines perhaps. Or full screen with a lot of line returns. I think you can target a specific area though and that would be best. The nice thing is that you don't have to worry about changes to layout and images as you would need to with HTML !
It looks like regions are used in Sikuli for areas. Region(x, y, w, h)