Seems everything's in order with bike to run, engine wise. From your video, it's just not getting petrol from carbs, most likely clogged due to sitting. To confirm, squirt 2-3cc petrol into airbox, let sit for 30-sec, then try starting.
Carbs and petcock just needs complete restoration. You will
NOT find any shop that can do this kind of work. Carbs are extremely specialised field mastered by very few elf-like creatures from black forests. Search for "clean carbs ducatiman" to find threads with how-tos and photos. Your best bet is to send to
https://customcarbservices.com for restoration work. Carbs will come back
brand-new and bike will run like it just came off showroom floor.
I've sent carbs in several times for refurb when I rebuild race-bike over winter. Since I run in stock-class, factory-fresh clean carbs is one of few "upgrades" that'll give me an edge over competition.
Related threads:
https://www.ninjette.org/forums/showthread.php?t=369351 - ColoradoCal
https://www.ninjette.org/forums/showthread.php?t=367339 - Detrailers <-- this guy is actually mechanic with moto-shop
https://www.ninjette.org/forums/showthread.php?t=365823 - ChicagoBob
https://www.ninjette.org/forums/showthread.php?t=354327 - clakmurrick
https://www.ninjette.org/forums/showthread.php?t=352293 - notunderweight
https://www.ninjette.org/forums/showthread.php?t=366273 - KurtF
https://www.ninjette.org/forums/show...13#post1225613 - MakoMoto
https://www.ninjette.org/forums/show...8&postcount=48 - aaronbtxnc
https://www.ninjette.org/forums/show...9&postcount=56 - 22R88
https://www.ninjette.org/forums/show...&postcount=100 - DevinWolfe
https://www.ninjette.org/forums/show...&postcount=102 - atomicrider266
https://www.ninjette.org/forums/show...&postcount=107 - FSTASFCK
https://www.ninjette.org/forums/show...&postcount=132 - roundhouse
https://www.ninjette.org/forums/show...&postcount=134 - Ghostt
https://www.ninjette.org/forums/show...&postcount=150 - inconer