1. I think first, you would need to know some Japanese.
2. Then find out what steps there are to work in Japan.
Is it doable since living in Japan is expensive. Most likely you will need a another job.
I doubt being a camera man pays well.
3. After that you might want to look at ads that could be hiring, specifically to the studios.
4. You might do better working around SE Asia doing small camera work and grow a
reputation and where it's English friendly. Singapore, Hong Kong, Taiwan, etc.