Yes Hot air balloon service is available in kashmir. Apart from visiting the popular tourist places in kashmir you can now have a aerial view of this beautiful heaven at Zabarwan moutains in srinagar.It's a 10-minute ride that will undoubtedly be the most memorable ten minutes of your life.
https://travelmykashmir.com/hot-air-balloon-srinagar-booking/ you can click on this link for online booking.