How to use OpenCV-Python in Ros for publishing coordinates of a Color after converting OpenCV feed to Ros format

edit

->You need to create one node send/publish an image from OpenCV feed after converting it into ROS format. ->On a 2nd node you need to subscribe the image and process it, meaning either detect a object or color in the video and send/ publish on another topic yes or no, the location of the object in the image. ->And finally on a 3rd node subscribe to the topic publishing the message of yes/ no or the coordinates of the object.