Represents a targetable position within a pod within a video stream. A video ad can be targeted
to any position in the pod (first, second, third ... last). If there is only 1 ad in a pod,
either first or last will target that position.
The specific index of the pod. The index is defined as:
1 = first
2 = second
3 = third
100 = last
100 will always be the last position. For example, for a pod with 5
positions, 100 would target position 5. Multiple targets against
the index 100 can exist.
Positions over 100 are not supported.