can't see camera when adding zoom to obs

[get the rebound]

hey
when I try to add zoom to my obs streaming, i can't see both streams. I mean if my obs camera is on, then the zoom doesn't show video and if the zoom shows video, then I can't see video with my obs camera. how do I fix it ? to be able to have both zoom and obs show video ? ( I use a web cam that is in the computer and use a Dell G5 15 with 8 gig of memory)

Thanks!

J