Why were you filming your first day of "parkour training"?
Why were you getting on roofs your first day of "parkour training"?
Seriously, I've been training for months and I've never left ground level, or done any filming for that matter.
Train for a couple of months so we can have some technique we can give constructive criticism on. Then we'll be able to say "you need to tuck more on this", or "you need to work on your rolls". Right now all we're going to do is tell you what you shouldn't be doing.
Other than keep off roofs, train the basics, and welcom to Parkour and the APK community!