Similar to LingQ there is Migaku which can do this for YouTube and other sites. It definitely has significantly aided my learning and made it a zero friction and even fun experience to learn another language.
You should try Lingopie.com, Its like the Netflix of Lanuguage learning.
It's way more developed & Polished than Migaku or Language Reactor ... Migaku is only a chrome extension and Lingopie has thousands of TV shows and movies & also works with Netflix & Disney plus. Plus it has tons of language learning features and tools that Migaku has. You can also watch and learn on iOS & Android plus on your TV with their Smart TV apps.
There's also https://nuenki.app (disclaimer: I made it), which applies the same approach to every single website*. It translates appropriate-difficulty sentences into your target language, and you can hover for definitions, pronunciations, etc.
I actually want to learn German, but I want to learn it by reading German texts and starting from zero, even though that makes it challenging.
I need to look up definitions and such, but translating the entire page defeats the core purpose. This app in my case is just perfect match! Thank you for sharing!
I'll drop this here: If anyone wants to work on Language Reactor (well compensated), my email is in my profile. I'm planning to start open-sourcing much of it soon.