@sdetweil motion mounted and feeding the modules of Magic Mirror through the stream direction that motion creates, and they are working pretty well.
There is a little more consumption in the resources, but in the absence of testing it more I would say that the problem is solved.

@sdetweil thank you very much for your answer.
I will try to configure it in the way in which you are indicating me.
I will update this post if I can get it to work on that way.
Best regards.

Hello averyone mates,

I write because I am having problems when wanting to use several modules that both need access to the camera. Specifically, they are MMM-Face-Reco-DNN and MMM-MotionDetector.
The error that the console shows me is the following:

[28.04.2021 19:38.32.307] [LOG] [MMM-Face-Reco-DNN] starting video stream…
[28.04.2021 19:38.37.680] [ERROR] Whoops! There was an uncaught exception…
[28.04.2021 19:38.37.763] [ERROR] PythonShellError: [ WARN:0] global /home/pi/opencv/opencv-4.5.0/modules/videoio/src/cap_gstreamer.cpp (1761) handleMessage OpenCV | GStreamer warning: Embedded video playback halted; module v4l2src0 reported: Device ‘/dev/video0’ is busy
[ WARN:0] global /home/pi/opencv/opencv-4.5.0/modules/videoio/src/cap_gstreamer.cpp (888) open OpenCV | GStreamer warning: unable to start pipeline
[ WARN:0] global /home/pi/opencv/opencv-4.5.0/modules/videoio/src/cap_gstreamer.cpp (480) isPipelinePlaying OpenCV | GStreamer warning: GStreamer: pipeline have not been created
[ WARN:0] global /home/pi/opencv/opencv-4.5.0/modules/videoio/src/cap_v4l.cpp (893) open VIDEOIO(V4L2:/dev/video0): can’t open camera by index
Traceback (most recent call last):
File “modules/MMM-Face-Reco-DNN/tools/facerecognition.py”, line 111, in
frame = imutils.resize(originalFrame, width=500)
File “/home/pi/.local/lib/python3.7/site-packages/imutils/convenience.py”, line 69, in resize
(h, w) = image.shape[:2]
AttributeError: ‘NoneType’ object has no attribute ‘shape’

at PythonShell.parseError (/home/pi/MagicMirror/modules/MMM-Face-Reco-DNN/node_modules/python-shell/index.js:254:21)
at terminateIfNeeded (/home/pi/MagicMirror/modules/MMM-Face-Reco-DNN/node_modules/python-shell/index.js:129:32)
at ChildProcess.<anonymous> (/home/pi/MagicMirror/modules/MMM-Face-Reco-DNN/node_modules/python-shell/index.js:121:13)
at ChildProcess.emit (events.js:315:20)
at Process.ChildProcess._handle.onexit (internal/child_process.js:275:12) {

executable: ‘python3’,
options: null,
script: ‘modules/MMM-Face-Reco-DNN/tools/facerecognition.py’,
args: [
‘–cascade=modules/MMM-Face-Reco-DNN/tools/haarcascade_frontalface_default.xml’,
‘–encodings=modules/MMM-Face-Reco-DNN/tools/encodings.pickle’,
‘–usePiCamera=0’,
‘–source=0’,
‘–rotateCamera=0’,
‘–method=dnn’,
‘–detectionMethod=hog’,
‘–interval=2000’,
‘–output=0’,
‘–extendDataset=False’,
‘–dataset=modules/MMM-Face-Reco-DNN/dataset/’,
‘–tolerance=0.6’
],
exitCode: 1
}

Does anyone know how it could be solved? the camera used is an “eye ps3” and everything about a rapsberry pi 3.

Thanks in advance!