1. A method for monitoring at least one vehicle passenger in a vehicle, the method comprising: capturing images of the vehicle passenger using at least one camera directed toward a first bodily region; analyzing the captured images of the first bodily region using at least one processor; determining a first vital sign and a second vital sign different from the first vital sign of the vehicle passenger, the determining of each of the first and second vital signs being based on the image analysis of the captured images; determining, based on the determined first vital sign and the second vital sign, one or more diagnostic values for: (i) tachycardia or bradycardia, (ii) heart rate variability, and (iii) tendency related to viral infection; and recommending a suitable countermeasure based at least on the determined one or more diagnostic values, wherein the determined first vital sign is a pulse rate and the second vital sign is a breathing rate, and wherein the first vital sign and the second vital sign are both determined from the same captured images of the first bodily region so that it is unnecessary to move or rotate the at least one camera toward a second bodily region to determine the second vital sign.