Glad exclusive_caps=1 worked for Zoom!

1. Autostart: there is no udev rule. It uses `/usr/lib/systemd/system-
generators/v4l2-relayd-generator`, which needs a config file in
`/etc/v4l2-relayd.d/`. Without it, the service won't start on boot.

2. Pipeline: added the leaky queue before appsink and explicit pad
linking from src_pad. Good catch on both.

3. Patch: looks like quilt mangled the formatting on the nested diff
earlier. Attached a clean debdiff, verified with patch -p1.


** Patch added: "v4l2-relayd 0.2.0-0ubuntu2 debdiff for libcamerasrc and 
SoftISP support"
   
https://bugs.launchpad.net/ubuntu/+source/v4l2-relayd/+bug/2166611/+attachment/5998581/+files/v4l2-relayd_0.2.0-0ubuntu2.debdiff

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https://bugs.launchpad.net/bugs/2166611

Title:
  v4l2-relayd unusable with libcamerasrc/SoftISP: sandbox blocks dma-buf
  allocator, and YUY2 caps never negotiate (black frames)

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