Can I make 2 videos at the same time using the same camera?

[Sasson10]

I've been thinking of making a kind of video where it starts as a beat saber mixed reality video, but every now and then It'd cut to how I look In reality, so to do It I need to make 2 videos, each one with a different scene (one with a mixed reality scene and one with a normal scene) and somehow film them at the same time... is that possible?