How Colorize B/W video like Legendfilms,

[Grinner Hester]

keys and animated masks are all ya need, man.
It’s amazing how much work you can save with a little color keying. Sometimes, depending on the colors, thats all ya gotta do.

[José Barreira]

Thank you grinner hester

already I tried to make keys with mocha but i don`t if is the is the best program to do that.
can you suggest one or more program to do that (colorize), Key…
Tank you again
José Araujo