Vavle cover gasket or timing cover gasket?

I am getting a slight burn smell from the engine bay (2005 tacoma 4.0 V6). Looks like I have a bit of a leak. I am thinking that the valve cover gasket might be the problem (see photos). However, it looks like the leak comes from the area where the timing cover meets the valve cover. Sorry if I'm not explaining well, English is not my first language. Please see attached screenshot from youtube video. How can I idendify the true source of my leak? Worst case scenario I could probably replace both. But I'd prefer not to do unnecessary work.
Any guidance would be greatly appreciated.

Cheers

 

Clean it really well and put some gasket maker (FIPG) in that section where they meet and install a new valve cover gasket.

 

It looks like it's all one peice with one gasket right? If so, RTV along the curved portion where it's leaking and proven to fail the most and then a new gasket on top will probably be best.

 

This ^

 

Definitely valve cover gasket. They do leak on the 2nd gens after so many miles. Mine leaked under 100K.