‘In most modern city centres, our movements are constantly tracked, due to the ubiquitous presence of surveillance cameras.’

Common mistake:

‘Our movements are constantly tracked due to there are many surveillance cameras‘. 

‘Our movements are constantly tracked because there are many surveillance cameras’. OK

• ‘due to’ cannot replace ‘because’ 

Correction:

‘Our movements are constantly tracked due to …

• a noun (the ubiquitous presence of surveillance cameras)
• the fact that + Subject-Verb-Object (due to the fact that there are surveillance cameras everywhere)
• +ing form (there being so many surveillance cameras)

Notice:

‘because there are‘  = ‘due to there being‘