Placing a 2d image for each trackable detected??

Hi all My requirement is that in the camera frame whatever trackables have been identified some screen coordinates(x,y) for each of them should be returned to the android code so that I can place one 2d bitmap for each of them... Any idea how can I get some approximate x,y coordinate(may be centre of each trackable identified in frame) from the qualcomm code and then return it to the android code so that i can place one 2d bitmap on those x,y coordinates... I know the problem is not too difficult...If i have time i can figure it out but Iam running short of time:( ...So please need help!!