help with mouse as tracker position

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Hello everyone,

I'm using a trackball mouse for navigation and i want that the mouse will act as a tracker position in order to link it to the main view (to set the point of view of the user according to the mouse). I need to get the x and z coordinates of the mouse constantly while maintaining the y coordinate fixed to 1.8. The reason for using a tracker is because i want to initiate different starting position with randint methode.
I saw an explanation about vizconnent but i didn't understand exacly how to use it and i'm not sure it can resolve my problem.

Thanks in advance and have a nice week.