Getting grayscale image from optitrack camera

Yes, all OptiTrack cameras have the capability of transmitting the entire grayscale frame to the host PC. Motive or the Camera SDK provides the ability to select the video mode and access the data. Furthermore, MJPEG grayscale video is also supported for transmitting downsampled images in order to reduce network traffic.

source: https://optitrack.com/support/faq/general.html

note: helps with identifying false positives for the IR markers.