#dash cam DVR Software
https://github.com/maxneaga/open_dash_cam_android
#apk
https://play.google.com/store/apps/details?id=com.opendashcam
#Or I made a copy here:
https://archive.org/download/open_dash_cam/open_dash_cam_android/apk/open_dash_cam.apk

#set Android device to power on whenever it is connected to power
fastboot oem off-mode-charge 0

#set DASH cam software to launch whenever the device is powered on or unlocked
#this doesn't seem to work any more
https://f-droid.org/en/packages/news.androidtv.launchonboot/

#user termux-boot 
https://f-droid.org/en/packages/com.termux/
https://f-droid.org/en/packages/com.termux.boot/

cat > $HOME/.termux/boot/startup.sh                                                                    
#!/data/data/com.termux/files/usr/bin/sh
termux-wake-lock
am start --user 0 -n com.opendashcam/.MainActivity

#You may want to enable termux cron jobs to make sure that the camera doesn't stop
pkg install cronie termux-services
#restart termux
sv-enable crond
crontab -e 
*/5 * * * * $HOME/.termux/boot/startup.sh >/dev/null 2>&1

#to easily access recorded videos use amaze create a shortcut
https://f-droid.org/en/packages/com.amaze.filemanager/

#Recordings are saved to:
/sdcard/Android/data/com.opendashcam/files/Movies/

#use something like Syncthing to backup videos to a remote server
https://search.f-droid.org/?q=syncthing