This seed pod does not appear to have made a successful fertilization; it is only slightly swollen. It should be almost double in circumference.
Since it is 14 months old I suggest to do a green-pod sowing now, but I do not think you will find mature seeds inside. Instead, I suggest you use your knife to scrape/cut small pieces from what 'look like' seeds and drop them directly onto the agar surface. This sometimes works and embryos will slowly develop into protocorms, but sometimes not.
Nearly all paphiopedilums require a separate clone to produce fertile seeds. Also, you probably do know the precise mechanics of just how to manipulate the pollen and smear it across the stigmatic surface to make positive contact; it is a particularly important process with certain species. Maybe this is one.
Next, time I would do a green-pod sowing at 9-10 months if the capsule swells to a 'normal' size
In addition, 'dry' pollen grains often are not quite as mature as 'gooey' pollen grains and the latter seem to always work better. The P. canhii pollen I've seen has been 'dry' and appeared immature.
And, Holger Perner has an excellent orchid germination medium that works for very many orchid types. I would ask him for his advice on flasking and for his medium choice.