Has it started since this thread?
https://www.skoolie.net/forums/f33/i...art-38208.html
Watching your video, the guages sweeping while cranking shows a low voltage issue or datalink communication issue, be it caused by dead batteries, bad connections or grounds, etc.
From your other thread, those codes are from the transmission, you need to go through the diagnostics for the engine, either from flashcodes through a diagnostic button or using a scan tool.
Find a service manual for your engine and go through the steps for crank/no start. I believe someone posted one on here once and a search should find it.