how to record video and audio at the same time on computer

fonelab

I want to play video and background music on computer and then sing a song. And how can it record video and audio at the same time?
I found that FoneLab screen recorder is a useful tool to enable users to capture audio and video at the same time without lag.
And you can easily share or save the high-quality lossless recording to computer or youtube website.

HuduVudu

OBS is the best tool for this sort of thing. It is mostly used for streaming, but the file creation is excellent and often ignored.