I know this an old thread but I have a similar noise only at start up but hear a tapping around the rear cylinder head. It only does it when the engine is cold. If I shut it down and start it up it only makes the ticking noise. Here is a video noise after start up
The video did not work for me.
First, the screen opened with your video hidden off the top of the screen.
When I figured that out, all it did was display a spinning circle, seemingly forever.
Then.....diagnosing a noise like that with a video is almost NEVER worth the time and trouble to guess.
A shop visit will likely be required.
Or maybe a visit from a friend who has some engine experience.