Tf1 position change reflected to another Tf2 [closed]

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My head is going to blow now but this is what I would love to do. I have Oculus and a Camera attached to it. In ROS, I have 2 TFs. One is "oculus" and the other is "ptam" (camera). Oculus tf is not moving - only rotating by input from Oculus. Camera is running ptam algorithm and so have its own tf ("ptam") moving in the world (position + orientation). How can I reflect changes in position of "ptam" within its own coordinate system to my "oculus" and its own coordinate system? The result would be, if the camera moves forward, oculus does as well.

Thank you!