When using the TV method on a new language, there are a lot of new words that you can eventually understand directly from the situation and what you see happening on the screen. I say "eventually" because even though it is quite obvious, you probably won't pick up on it the first time you see it. It may be on the second viewing or even later when you are ready to learn that new word. For the not-so-obvious, you may just be wondering what the words mean and you keep noticing them and then one day it becomes obvious to you. You'll learn it when you're ready. That's how the brain works.
In the beginning, you'll be oblivious to most words. (Why are "obvious" and "oblivious" so similar-looking when the meanings are almost opposites?) Eventually, of course, the words start making themselves known to you. They have a funny way of doing that. And through exposure, the new words will become old words.
The natural approach advocates that you don't speak at all in the beginning. Which makes sense because, really, what kind of conversation are you going to have when you only know 10 words? So you won't have any problem refraining from using new words in the early stages. But how about the later stages when you've acquired enough of the language to speak it? Should you try to use new words right away? If you've read the title of this post, my answer should be obvious.
When words are still new to you, you're not ready to use them. You need time to get to the point where you know how the word sounds. You may also need more time to redefine your understanding of the new words. And last but not least, words should come out of your mouth without you having to think about them. A new word is not ready to do that. With new words, you would have to stop and think, and remember.
Like old friends, old words are your friend. They're comfortable. You know what they mean. You can use them without even thinking. Give your new words time to grow and when they become old you'll be using them too without so much as a thought.
So it's not new words you want to acquire. It's old words! That's why study and memorization should have no place in language acquisition. 5,000 new words and only a few hundred old words won't do you much good. Spend your time getting exposure to the language instead of thinking about words. You take care of the language input and the words will take care of themselves.