Yes you can as long as you don't dilute the vinegar. Using straight 5% vinegar allows lots of room for infusing various things with no concerns. It is only when we further dilute the vinegar further with more water that we run into restrictions.

Dave

I don't understand the method !!

Why to infuse Cayenne pepper in vinegar (in the first place ) and then take it out ???. Peppers infused in 100% vinegar can be kept indefinitely but will get soft.

Cayenne is one of the peppers that can be air dried easily. and you can also dry them in oven (Lowest setting) or better yet in a dehydrator.

JMO

Sey

She is talking about making flavored vinegar, not preserving the peppers. In this case pepper flavored vinegar.

Making Flavored Vinegars

Dave's correct. I am infusing the cayenne pepper's capsaicin medicinal qualities (and flavor) into the cider vinegar. I'll try using it sparingly in salad dressing (I'll add just a teas or so).