Getting Unity to recognize a camera-powered jump will not be straightforward, unfortunately. The link below has an article about how the problem of jump recognition in Unity was approached using a Kinect camera.
https://lightbuzz.com/jump-detection-kinect/
In that article, their detection is based on body joint position. To do that with a RealSense 400 Series camera, it would be necessary to use a software package called Nuitrack SDK, which fortunately is integrated very well with Unity and has test samples for it on the Unity Asset Store.
Nuitrack SDK
https://nuitrack.com/
Nuitrack on the Asset Store
https://assetstore.unity.com/packages/templates/packs/nuitrack-skeleton-tracking-127675
A user called Westa who is experienced in both Nuitrack and RealSense suggested an approach for creating a jumping gesture in Nuitrack.
https://community.nuitrack.com/t/how-to-update-new-gesture-in-nuitrack-gesturetype-sample-jump-gesture/505
In my own work with RealSense and Unity, the approach I took was to control a Unity object with camera inputs and trigger a jump action when lifting my real-world head up high (representing the action of making a physical effort to jump).
Edit: I thought it might be useful to show a practical example of jump detection with Kinect, in a Kinect launch game in 2010 called 'Sonic Free Riders'.
https://www.youtube.com/watch?v=f2yRBWW9rKc
