Yes, you may as long as the proper credit is given in the video description: url to the game website along side the developer name "Black Curtain Studio" and website url.
At the moment only one game developer. However, some aspects of development like music, SFX and voice acting are third party hired help.
Unfortunately, no. I do not have the resources to offer any trainee programs at this moment, but I will gladly answer any questions I can in regards to game development.
Black Curtain Studio tends to look for these types of resources as they are needed and for the most part this role is already filled by inside help.