Loud chirping noise.

Lifters don't sound like that.

Cams don't make dry, rubbing sounds like that. That is metal on metal, pretty light metal/ not something cast.

If a cam goes out, you get a misfire, PCV valve starts buzzing/ vacuum leak type symptoms/ consistent misfire. It sounds like it's running fine.

That's coming from underneath.

At the 1:00 mark, your starter is NOT engaging the converter teeth. That is a sign, right there, that something is up. My guess is that the flexplate bolts are loose and it's fallen away from the crank, causing the starter to engage very shallow, explains the noise and the starter problem.

Crawl under it, pull the starter and the splash shield and check it out. I guarantee you'll find something.