If you had repeating "Webcam incompatible" notifications in VRChat's open beta, today's update should fix it. (Could occur if "Quality Level" was set to "Off" which happens on low fps due to Auto-Adjust. You'll need to adjust both those settings to turn camera tracking back on)

You can find the option to enable it here in the main menu Tracking&IK settings page. That little VRC+ icon is because this is considered "early access" for VRC+ for now but we intend to take it to general access eventually

In VRChat's current open beta, PC desktop users can try out the "Selfie Expression" feature, which adds webcam based head, mouth, eye, hand and finger tracking, so you can move around like this without needing VR (all you need is a webcam)