How to record the gaze data and the VR scene simultaneously using HTC Vive and pupil lab in unity?

I am new to Unity and The VR/AR development area. I am trying to build a project where I have multiple objects in a VR scene and want to track the eye gaze data. My goal is to record a video of the VR scene with the timed gaze data on it. Please guide me to creating this.

I could record the eye data using pupil capture software but the VR scene is not there. How can I merge these two things?