I managed to figure out what this class is about (remember, it is passed as a parameter to the vision detection callbacks but is not documented and as introspection is disabled, there was no way to try to infer its methods/fields). Now here it is, in all its glory!
    class ImageInfo(object):
        class Pos(object):
            def __init__(self):
                self.x = 0
                self.y = 0
        class Size(object):
            def __init__(self):
                self.w = 0
                self.h = 0
        def __init__(self):
            self.type = 0
            self.info = 0
            self.distance = 0
            self.pos = self.Pos()
            self.size = self.Size()

It is pretty simple, but it allows you do get informationm about the detected object (dunno what it does in case of multiple objects detected). It also seems to include the distance to an object (most likelly only when detecting the vision markers) without needing an extra call to get the desiderd information. Might speed things uip a bit.

Hello and good day BGA. Thank you for reaching out and for sharing this information with us. Thank you for your support.