i think you can instal with the consent of tenant , because the cctv camera defintly ll disturb his privacy and there is no law which alows a landlord to put his feet in the others shoes wdout his permision. when a tenant hires a shop etc on rent than that become his property till the agreed period with some exceptions. tenant can run his shop acording to his will under the existing law.
if you have any threat from your tenant which amounts to mischivous act than you can adopt a legal procedure throu court or police, but forcibly you even cant vacat the shop
if you think that court will alow you to instal camera than i think thre is provision of law which permits interference in tenant privacy