1 INTRODUCTION  
2 DATA AND SAMPLE SELECTION  
2.1 The VISTA-VIDEO survey  
2.2 Multi-wavelength datasets  
3 TOOLS AND ANALYSIS  
3.1 Environment density parameters  
3.2 Control samples  
4 RESULTS  
4.1 X-ray AGN environment  
4.2 Radio AGN environment  
4.3 Mid-IR AGN environment  
5 DISCUSSION  
5.1 Photometric redshifts  
5.2 Mergers as triggers for nuclear activity  
6 CONCLUSIONS