I use Vector S but haven't yet used them on my track bike.
Shouldn't have any problem with the pedal pods on a track bike, as the bars would probably hit the deck first, then the pedals.
Make sure you retourqe and calibrate before every ride, and set the correct bike profile on the Garmin Head Unit showing crank length mainly.
Also need to think about how you are going to use the data. If you're training for a pursuit, its great as you can ride the right wattage for x amount of laps. This could also be used when attacking in a scratch race. How would you use this in a points or elimination race though where you are sprinting and recovering time after time, especially as most velodromes (here in the UK anyway) don't allow any head unit attached to the bike
Climatic conditions can also effect power where you can't see the output. In a headwind, you will be putting out more watts per given km/h than you would in a tail wind.
Another useful tool is measuring cadence