A miniaturized cavity-enhanced room-temperature magnetic-field sensor based on nitrogen-vacancy centers was demonstrated by our group. The sensitivity and small size of the detector make it an ideal candidate for endoscopic magnetic field measurements aiming at biomedical applications. In contrast to most NV-based magnetometers the magnetic signal is extracted by observing infrared absorption of the NV centers. Thus, it does not suffer from common shortcomings of photoluminescence-based detectors (e.g. low photon-detection efficiency). Finally, it features an improvement by a factor of $\sim$ 100 in sensitivity for a 10 times smaller sensor volume compared to previously published results on absorption-based magnetometers. More information on the sensor can be found on the following link: https://arxiv.org/pdf/1706.02201.pdf