Blown head gasket? Need new engine?

Until you have five messages, you will not be able to post links to other resources.
What do you have besides the video? Diagnostic data, codes with error designations?

How, besides the sound, did you determine the blown engine head gasket?

 

Assuming it is head gasket failure, you’ll need something. Most expedient is to acquire the Toyota gasket kit (includes replacement head gasket) and new head bolts (not mandatory if old ones are still within specs, but prudent). Doing the job yourself can be just the cost of those items, say around $300~400 USD. If you employ a machine shop, say to refurbish the head, maybeanother $500~1000?

regarding “new” engine, it’d more accurately be salvage or refurbished engine. Hybrid Pit Stop is one source, worth checking out.

Turnkey quotes vary widely, say $2500~$6000.

My 2 cents: a full EGR system clean at least every 50k miles, this wouldn’t be happening.

attached has parts nos for aforementioned gasket kit and head bolts. Also have a look at links in my signature. Last one is full engine section from repair manual. (On a phone turn it landscape to see signatures).

 

Welcome;
If you catch this problem early enough; you may only need a head gasket replacement. Try these guys.

Prius Head Gasket Repair San Francisco, CA | Gasket Masters, Inc.