Genlock is supposed to be syncing the camera shutter to the same clock as the Vive Mars. Since your camera doesn’t have Genlock, there’s not point in adding Genlock downstream, since it doesn’t do anything to keep anything in sync. 

Hi,

This issue typically happens when a system is not fully genlocked. The delay between the camera frames and the tracking data constantly changes
In your case, it's your camera that is not genlocked.
To achieve perfect sync, every component must be genlocked (camera, tracking system, capture card).
You can read more about syncing here: https://aximmetry.com/learn/tutorials/for-studio-operators/syncing-and-genlock/ 

Warmest regards,

How to achieve perfect synchronization without Genlock for a camera? Can a timecode be used in conjunction with Mars?

Hi,

Note that the good configuration is not to send timecode from the camera to Mars, but to use an external timecode generator that feeds both devices.

According to the VIVE Mars specifications, the system supports timecode sync via LTC over a 3.5 mm connector. Your camera may be able to receive timecode through SDI as well, depending on the exact model and configuration. If you can share more details about your setup, we will likely be able to give a more precise answer.

Also, note that Aximmetry has a Timecode Sync parameter, and it is turned on by default.: https://aximmetry.com/learn/virtual-production-workflow/green-screen-production/tracked-camera-workflow/inputs-tracked-camera/#timecode-sync 

Warmest regards,