Hi,

Yes, you can use the iPhone for tracking only while the DSLR camera is capturing video for it.
Just ensure that the iPhone is firmly attached to the DSLR camera, preventing any relative movement between them during production.

Furthermore, if the Camera Calibrator is used with this setup, it will calculate the offset between the DSLR camera and iPhone, thereby enhancing the tracking accuracy: https://aximmetry.com/learn/virtual-production-workflow/preparation-of-the-production-environment-phase-i/tracking/camera-calibrator/

Warmest regards,

We have tutorials for Aximmetry eye:
https://youtu.be/vI_b2OO4yZE?si=EneDHq64pzgr1fcr