Problems displaying RGB image without background

[lnegrol]

Hello everyone, I'm working with C ++, libfreenect, OpenNI2, NiTE2 and OpenGL in Ubuntu 12.04.

I'm trying to show my body image in RGB without displaying the background, but I'm not able to. Could anyone help me to explain or show me how should I?

With the SDK 2.0 on Windows easily, but on Linux I am not able to.

Thank you very much. A greeting.