So I wanna start making videos online... Me playing games. I wanna know if it's all right if I can swear AT the game and AT non-existent-people(ai/npc) and not swear at real life people. The game you could think of as an inanimate object?? Also, I want to know if I can show myself through YouTube like putting in a facecam for my gameplays and stuff like that.
Islam does not differentiate between cursing on animate and non-animate objects. It is the act itself which is disliked.
Ibn Mas'ud (May Allah be pleased with him) said: The Messenger of Allah (ﷺ) said, "A true believer does not taunt or curse or abuse or talk indecently."
Abdullah narrated that the Messenger of Allah said: "The believer does not insult the honor of others, nor curse, nor commit Fahishah, nor is he foul."
Allah's Messenger (ﷺ) said. "It is one of the greatest sins that a man should curse his parents." It was asked (by the people), "O Allah's Messenger (ﷺ)! How does a man curse his parents?" The Prophet (ﷺ) said, "'The man abuses the father of another man and the latter abuses the father of the former and abuses his mother."
W.r.t showing your face on YouTube, it would depend. If you fear fitna due to your face being shown (maybe you are a handsome male or a beautiful female whose face distracts others in a wrong way and/or you fear you may gain arrogance due to the fame), then it is better to avoid it.
Games, singing or listening to music, dancing and seeing willingly dance, art, drawing, sculpture are harsh in Quranic Islam, and I hope if you are a Muslim brother you will avoid it, it's all up to you and your choice.