it's possible? How can i do it?
Probably not through Plays.tv. We use the H.264 encoder to hook directly into the GPU and grab frames. If the Unity Editor is not utilizing DirectX or OpenGL, it won't be able to record. Even then, if it's not detected in our system it could time-out. You may want to utilize a piece of software that can do screen recording like OBS.
Let me know if you need more information.