Here is a Vipassana meditation you could consider trying.

It's not Pranayama, but it is a great start to observing the breath and building up your focus and awareness on the breath.

Will work on a Yogic Breathing technique soon. Will share that with you once I do.

Hope the quality of the recording doesn't effect the impact on your practice.

Cheers
https://steemit.com/dsound/@kchitrah/20181027t151802764z-vipassana-3